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[peer-ee-uh d] /ˈpɪər i əd/

noun
1.
a rather large interval of time that is meaningful in the life of a person, in history, etc., because of its particular characteristics:
a period of illness; a period of great profitability for a company; a period of social unrest in Germany.
2.
any specified division or portion of time:
poetry of the period from 1603 to 1660.
3.
a round of time or series of years by which time is measured.
4.
a round of time marked by the recurrence of some phenomenon or occupied by some recurring process or action.
5.
the point of completion of a round of time or of the time during which something lasts or happens.
6.
Education. a specific length of time during school hours that a student spends in a classroom, laboratory, etc., or has free.
7.
any of the parts of equal length into which a game is divided.
8.
the time during which something runs its course.
9.
the present time.
10.
the point or character (.) used to mark the end of a declarative sentence, indicate an abbreviation, etc.; full stop.
11.
a full pause, as is made at the end of a complete sentence; full stop.
12.
a sentence, especially a well-balanced, impressive sentence:
the stately periods of Churchill.
13.
a periodic sentence.
14.
an occurrence of menstruation.
15.
a time of the month during which menstruation occurs.
16.
Geology. the basic unit of geologic time, during which a standard rock system is formed: comprising two or more epochs and included with other periods in an era.
17.
Physics. the duration of one complete cycle of a wave or oscillation; the reciprocal of the frequency.
18.
Music. a division of a composition, usually a passage of eight or sixteen measures, complete or satisfactory in itself, commonly consisting of two or more contrasted or complementary phrases ending with a conclusive cadence; (def 3).
19.
Astronomy.

20.
Mathematics. See under 1 (def 5).
21.
Classical Prosody. a group of two or more cola.
adjective
22.
noting, pertaining to, evocative of, imitating, or representing a historical period or the styles current during a specific period of history:
period costumes; a period play.
interjection
23.
(used by a speaker or writer to indicate that a decision is irrevocable or that a point is no longer discussable):
I forbid you to go, period.
[peer-ee-od-ik] /ˌpɪər iˈɒd ɪk/
adjective
1.
recurring at intervals of time:
periodic revivals of an interest in handicrafts.
2.
occurring or appearing at regular intervals:
periodic visits by doctors to the village.
3.
repeated at irregular intervals; intermittent:
periodic outbreaks of the disease.
4.
Physics. recurring at equal intervals of time.
5.
Mathematics. (of a function) having a graph that repeats after a fixed interval (period) of the independent variable.
6.
Astronomy.

7.
pertaining to or characterized by rhetorical periods, or periodic sentences.
/ˈpɪərɪəd/
noun
1.
a portion of time of indefinable length: he spent a period away from home
2.

3.
a nontechnical name for an occurrence of menstruation
4.
(geology) a unit of geological time during which a system of rocks is formed: the Jurassic period
5.
a division of time, esp of the academic day
6.
(physics, maths)

7.
(astronomy)

8.
(chem) one of the horizontal rows of elements in the periodic table. Each period starts with an alkali metal and ends with a rare gas Compare group (sense 11)
9.
Also called full stop. the punctuation mark (.) used at the end of a sentence that is not a question or exclamation, after abbreviations, etc
10.
a complete sentence, esp a complex one with several clauses
11.
(music) Also called sentence. a passage or division of a piece of music, usually consisting of two or more contrasting or complementary musical phrases and ending on a cadence
12.
(in classical prosody) a unit consisting of two or more cola
13.
(rare) a completion or end
/ˌpɪərɪˈɒdɪk/
adjective
1.
happening or recurring at intervals; intermittent
2.
of, relating to, or resembling a period
3.
having or occurring in repeated periods or cycles
n.

early 15c., “course or extent of time,” from Middle French periode (14c.) and directly from Medieval Latin periodus “recurring portion, cycle,” from Latin periodus “a complete sentence,” also “cycle of the Greek games,” from Greek periodos “cycle, circuit, period of time,” literally “a going around,” from peri- “around” (see peri-) + hodos “a going, way, journey” (see cede).

Sense of “repeated cycle of events” led to that of “interval of time.” Meaning “dot marking end of a sentence” first recorded c.1600, from similar use in Medieval Latin (in late 16c. English it meant “full pause at the end of a sentence”). Sense of “menstruation” dates from 1822. Educational sense of “portion of time set apart for a lesson” is from 1876. Sporting sense attested from 1898. As an adjective from 1905; period piece attested from 1911.
adj.

1640s, from French périodique (14c.), from Latin periodicus, from periodus (see period).

Periodic table in chemistry (1889) is from notion of the arrangement, in which similar properties recur at intervals in elements in the same area as you read down the rows of the table. This sense of the word is attested from 1872 (periodic law).

period pe·ri·od (pĭr’ē-əd)
n.

periodic pe·ri·od·ic (pĭr’ē-ŏd’ĭk)
adj.

period
(pĭr’ē-əd)

A punctuation mark (.) that ends a declarative sentence. A period is also used in abbreviations such as Mr. and Dr.

interjection

End of story. That is final: Don’t ask me again. Period