1. a token or indication; a piece of evidence: The smoke curling from the chimney was a sign that someone was in the cabin.
2. any object, action, event, pattern, etc., that is taken as conveying a meaning: I took her silence and fidgeting as a sign of disagreement.Rising sales of disaster survival kits are a sign of the times.
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. the objective indications of a disease.
9. any meaningful gestural unit belonging to a sign language.
10. an omen; portent: The general unrest was a sign of the approaching revolution.
11. sign of the zodiac.
12. sign language (def. 1).
13. traces, such as footprints or scat, 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.

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. to direct or appoint by a sign.

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.

26. to assign or dispose of by affixing one's signature to a document: She signed over her fortune to the church.
27. to record or authorize one's arrival (or departure) by signing a register.
28. sign off,
• to withdraw, as from some responsibility or connection.
• to cease radio or television broadcasting, especially at the end of the day.
• 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.
• log¹ (def. 18a).
30. to enlist, as in an organization or group; to register or subscribe: to sign up for the navy;to sign up for class.

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
• a board, placard, etc, displayed in public and inscribed with words or designs intended to inform, warn, etc
• (as modifier)
4. an arbitrary or conventional mark or device that stands for a word, phrase, etc
5. maths logic
• any symbol indicating an operation
• the positivity or negativity of a number, quantity, or expression
6. an indication or vestige
7. a portentous or significant event
8. an indication, such as a scent or spoor, of the presence of an animal
9. any objective evidence of the presence of a disease or disorder
10. astrology Compare sign of the zodiac

11. to write (one's name) as a signature to (a document, etc) in attestation, confirmation, ratification, etc
12. to make a sign; signal
13. to engage or be engaged by written agreement, as a player for a team, etc
14. to outline in gestures a sign over, esp the sign of the cross
15. to indicate by or as if by a sign; betoken
16. to use sign language

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