Pronunciation: (sīn), [key]
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. Med.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. See sign of the zodiac.
12. See sign language (def. 1).
13. Usually, signs. traces, as footprints, of a wild animal.
14. Math.
a. a plus sign or minus sign used as a symbol for indicating addition or subtraction.
b. a plus sign or minus sign used as a symbol for indicating the positive or negative value of a quantity, as an integer.
c. See multiplication sign.
d. See division sign.
e. a symbol, as &fullradic; or !, used to indicate a radical or factorial operation.

1. to affix a signature to: to sign a letter.
2. to write as a signature: to sign one's name.
3. to engage by written agreement: to sign a new player.
4. to mark with a sign, esp. the sign of the cross.
5. to communicate by means of a sign; signal: He signed his wish to leave.
6. to convey (a message) in a sign language.
7. direct or appoint by a sign.

1. to write one's signature, as a token of agreement, obligation, receipt, etc.: to sign for a package.
2. to make a sign or signal: He signed to her to go away.
3. to employ a sign language for communication.
4. to obligate oneself by signature: He signed with another team for the next season.
5. sign away or over,to assign or dispose of by affixing one's signature to a document: She signed over her fortune to the church.
6. sign in ( or out) to record or authorize one's arrival (or departure) by signing a register.
7. sign off,
a. to withdraw, as from some responsibility or connection.
b. to cease radio or television broadcasting, esp. at the end of the day.
c. become silent: He had exhausted conversation topics and signed off.
d. to indicate one's approval explicitly if not formally: The president is expected to sign off on the new agreement.
8. sign on,
a. to employ; hire.
b. to bind oneself to work, as by signing a contract: He signed on as a pitcher with a major-league team.
c. to start radio or television broadcasting, esp. at the beginning of the day.
d. Computers.log1 (def. 17a).
9. 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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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