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noun
1.
a token; indication.
2.
any object, action, event, pattern, etc., that conveys a meaning.
3.
a conventional or arbitrary mark, figure, or symbol used as an abbreviation for the word or words it represents.
4.
a motion or gesture used to express or convey an idea, command, decision, etc.:
Her nod was a sign that it was time to leave.
5.
a notice, bearing a name, direction, warning, or advertisement, that is displayed or posted for public view:
a traffic sign; a store sign.
6.
a trace; vestige:
There wasn’t a sign of them.
7.
an arbitrary or conventional symbol used in musical notation to indicate tonality, tempo, etc.
8.
Medicine/Medical. the objective indications of a disease.
9.
any meaningful gestural unit belonging to a sign language.
10.
an omen; portent:
a sign of approaching decadence.
11.
sign of the zodiac.
12.
sign language (def 1).
13.
Usually, signs. traces, as footprints, of a wild animal.
14.
Mathematics.

a plus sign or minus sign used as a symbol for indicating addition or subtraction.
a plus sign or minus sign used as a symbol for indicating the positive or negative value of a quantity, as an integer.
multiplication sign.
division sign.
a symbol, as or !, used to indicate a radical or factorial operation.

verb (used with object)
15.
to affix a signature to:
to sign a letter.
16.
to write as a signature:
to sign one’s name.
17.
to engage by written agreement:
to sign a new player.
18.
to mark with a sign, especially the sign of the cross.
19.
to communicate by means of a sign; signal:
He signed his wish to leave.
20.
to convey (a message) in a sign language.
21.
Obsolete. to direct or appoint by a sign.
verb (used without object)
22.
to write one’s signature, as a token of agreement, obligation, receipt, etc.:
to sign for a package.
23.
to make a sign or signal:
He signed to her to go away.
24.
to employ a sign language for communication.
25.
to obligate oneself by signature:
He signed with another team for the next season.
Verb phrases
26.
sign away/over, to assign or dispose of by affixing one’s signature to a document:
She signed over her fortune to the church.
27.
sign in, to record or authorize one’s arrival (or departure) by signing a register.
Also, sign out.
28.
sign off,

to withdraw, as from some responsibility or connection.
to cease radio or television broadcasting, especially at the end of the day.
Informal. to become silent:
He had exhausted conversation topics and signed off.
to indicate one’s approval explicitly if not formally:
The president is expected to sign off on the new agreement.

29.
sign on,

to employ; hire.
to bind oneself to work, as by signing a contract:
He signed on as a pitcher with a major-league team.
to start radio or television broadcasting, especially at the beginning of the day.
Computers. log1 (def 17).

30.
sign up, to enlist, as in an organization or group; to register or subscribe:
to sign up for the navy; to sign up for class.
noun
1.
something that indicates or acts as a token of a fact, condition, etc, that is not immediately or outwardly observable
2.
an action or gesture intended to convey information, a command, etc
3.

a board, placard, etc, displayed in public and inscribed with words or designs intended to inform, warn, etc
(as modifier): a sign painter

4.
an arbitrary or conventional mark or device that stands for a word, phrase, etc
5.
(maths, logic)

any symbol indicating an operation: a plus sign, an implication sign
the positivity or negativity of a number, quantity, or expression: subtraction from zero changes the sign of an expression

6.
an indication or vestige: the house showed no signs of being occupied
7.
a portentous or significant event
8.
an indication, such as a scent or spoor, of the presence of an animal
9.
(med) any objective evidence of the presence of a disease or disorder Compare symptom (sense 1)
10.
(astrology) Compare sign of the zodiac
verb
11.
to write (one’s name) as a signature to (a document, etc) in attestation, confirmation, ratification, etc
12.
(intransitive) often foll by to. to make a sign; signal
13.
to engage or be engaged by written agreement, as a player for a team, etc
14.
(transitive) to outline in gestures a sign over, esp the sign of the cross
15.
(transitive) to indicate by or as if by a sign; betoken
16.
(intransitive) to use sign language

sign (sīn)
n.

See symptom.

Something that suggests the presence or existence of a fact, condition, or quality.

A trace or vestige, as of disease or life.

sign
(sīn)

A body manifestation, usually detected on physical examination or through laboratory tests or xrays, that indicates the presence of abnormality or disease. Compare symptom.

See symbol. See Table at symbol.

sign