[oh-puh n] /ˈoʊ pən/
not closed or barred at the time, as a doorway by a door, a window by a sash, or a gateway by a gate:
to leave the windows open at night.
(of a door, gate, window sash, or the like) set so as to permit passage through the opening it can be used to close.
having no means of closing or barring:
an open portico.
having the interior immediately accessible, as a box with the lid raised or a drawer that is pulled out.
relatively free of obstructions to sight, movement, or internal arrangement:
an open floor plan.
constructed so as to be without cover or enclosure on the top or on some or all sides:
an open boat.
having relatively large or numerous spaces, voids, or intervals:
an open architectural screen; open ranks of soldiers.
perforated or porous:
an open texture.
relatively unoccupied by buildings, fences, trees, etc.:
not covered or closed; with certain parts apart:
open eyes; open mouth.
without a covering, especially a protective covering; unprotected; unenclosed; exposed:
an open wound; open electrical wires.
extended or unfolded:
an open newspaper.
without restrictions as to who may participate:
an open competition; an open session.
accessible or available to follow:
the only course still open to us.
not taken or filled; not preempted; available; vacant:
Which job is open?
ready for or carrying on normal trade or business:
The new store is now open. The office is open on Saturdays.
not engaged or committed:
Have you any open time on Monday?
accessible, as to appeals, ideas, or offers:
to be open to suggestion.
exposed to general view or knowledge; existing, carried on, etc., without concealment:
open disregard of the rules.
acting publicly or without concealment, as a person.
unreserved, candid, or frank, as persons or their speech, aspect, etc.:
an open manner.
generous, liberal, or bounteous:
to give with an open hand.
liable or subject:
open to question; open to retaliation.
several open questions.
without effective or enforced legal, commercial, or moral regulations:
an open town.
unguarded by an opponent:
an open wide receiver.
noting the part of the sea beyond headlands or enclosing areas of land:
to sail on the open seas.
free of ice, as a body of water or a seaport.
free of navigational hazards:
an open coast.
(of a seaport) available for foreign trade; not closed by government regulations or by considerations of health.
(of a microphone) in operation; live.
(of a delimiting punctuation mark) occurring at the beginning of a group of words or characters that is set off, as from surrounding text:
open parenthesis; open quotes.
Compare (def 51).
not yet balanced or adjusted, as an account.
not constipated, as the bowels.
Linguistics. (of a class of items) readily admitting new members, as the class of nouns, verbs, or adjectives (opposed to ).
free from frost; mild or moderate:
an open winter.
Animal Husbandry. (of a female animal) not pregnant.
Textiles. (of a fabric or weave) so loosely woven that spaces are visible between warp and filling yarns.
verb (used with object)
to move (a door, window sash, etc.) from a shut or closed position so as to admit of passage.
to render (a doorway, gateway, window, etc.) unobstructed by moving a door, window sash, etc., away from it.
to render the interior of (a box, drawer, etc.) readily accessible.
to clear (a passage, channel, etc.) of obstructions.
to clear (areas or passages in the body).
to give access to; make accessible or available, as for use:
to open a port for trade.
to establish for business purposes or for public use:
to open an office.
to set in action, begin, start, or commence (sometimes followed by up):
to open a campaign.
to uncover, lay bare, or expose to view.
to expand, unfold, or spread out:
to open a map.
to make less compact, less closely spaced, or the like:
to open ranks.
to disclose, reveal, or divulge.
to render accessible to knowledge, enlightenment, sympathy, etc.:
to open one’s mind.
to cut, blast, or break into:
to open a safe with nitro.
to make or produce (an opening) by cutting or breaking, or by pushing aside or removing obstructions:
to open a way through a crowd.
to make an incision or opening in:
to open a boil.
Cards. to begin a hand by making (the first bid), placing (the first bet), or playing (a given card or suit) as the lead.
Nautical. to sail (a course) so that the apparent location of a distant fixed object changes with relation to a nearer fixed object (sometimes followed by out).
verb (used without object)
to become open, as a door, building, box, or enclosure.
to afford access:
a door that opens into a garden.
to have an opening, passage, or outlet:
The room opens into a corridor.
(of a building, theater, etc.) to open its doors to the public:
The museum opens at one o’clock.
to begin a session or term, as a school.
to begin a season, series of performances, or tour, as a theatrical company:
The play will open in Boston.
to begin, start, or commence an activity:
The game opened with the national anthem.
to part, or seem to part, so as to allow or reveal a passage:
At last the cliffs opened to show us that we were heading for the sea.
to become disclosed or revealed.
to come into view; become more visible or plain.
to become receptive to knowledge, sympathy, etc., as the mind.
to disclose or reveal one’s knowledge, thoughts, feelings, etc.
to unfold or expand, as a blossom, so as to reveal the interior.
to spread out or expand, as the hand or a fan.
to spread apart or separate, as pages of a book, newspaper, etc.:
Open to page 32.
to spread or come apart; burst:
The wound opened.
to become less compact, less closely spaced, or the like:
The ranks began to open.
Cards. to make the first bet, bid, or lead in beginning a hand.
Hunting. (of hounds) to begin to bark, as on the scent of game.
an open or clear space.
the open air.
the open water, as of the sea.
an opening or aperture.
an opening or opportunity.
a contest or tournament in which both amateurs and professionals may compete, especially in golf and tennis.
not closed or barred: the door is open
affording free passage, access, view, etc; not blocked or obstructed: the road is open for traffic
not sealed, fastened, or wrapped: an open package
having the interior part accessible: an open drawer
extended, expanded, or unfolded: an open newspaper, an open flower
ready for business: the shops are open
able to be obtained; available: the position advertised last week is no longer open
unobstructed by buildings, trees, etc: open countryside
free to all to join, enter, use, visit, etc: an open competition
unengaged or unoccupied: the doctor has an hour open for you to call
See open season
not decided or finalized: an open question
ready to entertain new ideas; not biased or prejudiced: an open mind
unreserved or candid: she was very open in her description
liberal or generous: an open hand
extended or eager to receive (esp in the phrase with open arms)
exposed to view; blatant: open disregard of the law
liable or susceptible: you will leave yourself open to attack if you speak
(of climate or seasons) free from frost; mild
free from navigational hazards, such as ice, sunken ships, etc: open water
(US) without legal restrictions or enforceable regulations, esp in relation to gambling, vice, etc: an open town
without barriers to prevent absconding: an open prison
having large or numerous spacing or apertures: open ranks
full of small openings or gaps; porous: an open texture
(printing) (of type matter) generously leaded or widely spaced
See open cheque
(of a return ticket) not specifying a date for travel
(of a wound) exposed to the air
(esp of the large intestine) free from obstruction
undefended and of no military significance: an open city
(chess) (of a file) having no pawns on it
(maths) (of a set) containing points whose neighbourhood consists of other points of the same set: points inside a circle are an open set
(computing) (of software or a computer system) designed to an internationally agreed standard in order to allow communication between computers, irrespective of size, maufacturer, etc
to move or cause to move from a closed or fastened position: to open a window
when intr, foll by on or onto. to render, be, or become accessible or unobstructed: to open a road, to open a parcel, the door opens into the hall
(intransitive) to come into or appear in view: the lake opened before us
(transitive) to puncture (a boil) so as to permit drainage
to extend or unfold or cause to extend or unfold: to open a newspaper
to disclose or uncover or be disclosed or uncovered: to open one’s heart
to cause (the mind) to become receptive or (of the mind) to become receptive
to operate or cause to operate: to open a shop
when intr, sometimes foll by out. to make or become less compact or dense in structure: to open ranks
to set or be set in action; start: to open a discussion, to open the batting
(transitive) to arrange for (a bank account, savings account, etc) usually by making an initial deposit
to turn to a specified point in (a book, magazine, etc): open at page one
(law) to make the opening statement in (a case before a court of law)
(intransitive) (cards) to bet, bid, or lead first on a hand
the open, any wide or unobstructed space or expanse, esp of land or water
See open air
(sport) a competition which anyone may enter
bring into the open, to make evident or public
come into the open, to become) evident or public
Old English openlice “manifestly, plainly, clearly, unreservedly;” see open (adj.) + -ly (2).
Old English open “not closed down, raised up” (of gates, eyelids, etc.), also “exposed, evident, well-known, public,” often in a bad sense, “notorious, shameless;” from Proto-Germanic *upana, literally “put or set up” (cf. Old Norse opinn, Swedish öppen, Danish aaben, Old Saxon opan, Old Frisian epen, Old High German offan, German offen “open”), from PIE *upo “up from under, over” (cf. Latin sub, Greek hypo; see sub-). Related to up, and throughout Germanic the word has the appearance of a past participle of *up (v.), but no such verb has been found. The source of words for “open” in many Indo-European languages seems to be an opposite of the word for “closed, shut” (e.g. Gothic uslukan).
Of physical spaces, “unobstructed, unencumbered,” c.1200; of rooms with unclosed entrances, c.1300; of wounds, late 14c. Transferred sense of “frank, candid” is attested from early 14c. Of shops, etc., “available for business,” it dates from 1824. Open-handed “liberal, generous” is from c.1600. Open door in reference to international trading policies is attested from 1856. Open season is first recorded 1896, of game; and figuratively 1914 of persons. Open book in the figurative sense of “person easy to understand” is from 1853. Open house “hospitality for all visitors” is first recorded 1824. Open-and-shut “simple, straightforward” first recorded 1841 in New Orleans. Open marriage, one in which the partners sleep with whomever they please, is from 1972. Open road (1817, American English) originally meant a public one; romanticized sense of “traveling as an expression of personal freedom” first recorded 1856, in Whitman.
early 13c., “an aperture or opening,” from open (adj.). Meaning “public knowledge” (especially in out in the open) is from 1942, but cf. Middle English in open (late 14c.) “manifestly, publicly.” The sense of “an open competition” is from 1926, originally in a golf context.
Old English openian “to open, open up, disclose, reveal,” also intransitive, “become manifest, be open to or exposed to,” from Proto-Germanic *opanojan (cf. Old Saxon opanon, Old Norse opna “to open,” Middle Dutch, Dutch openen, Old High German offanon, German öffnen), from the source of open (adj.), but etymology suggests the adjective is older. Open up “cease to be secretive” is from 1921. Related: Opened; opening.
Online Public Education Network
noun, Engineering. 1. a control system in which an input alters the output, but the output has no feedback loop and therefore no effect on the input.
- Open look
operating system A graphical user interface and window manager from Sun and AT&T. Usenet newsgroup: news:comp.graphics.openlook. (1995-06-11)
[oh-puh n-lahyn] /ˈoʊ pənˌlaɪn/ adjective 1. (of a radio or TV show) maintaining open telephone lines to permit listeners or viewers to phone a program with comments, questions, requests, etc.; call-in. noun 1. (Canadian) a radio or television programme in which listeners’ or viewers’ questions, comments, etc, are telephoned to the studio and broadcast live. […]
noun 1. a letter, often of protest or criticism, addressed to a specific person, but intended to be brought to public attention. noun 1. a letter, esp one of protest, addressed to a person but also made public, as through the press