sign

adj : used of the language of the deaf syn gestural, sign(a), signed, sign-language(a)

n 1: a perceptible indication of something not immediately apparent (as a visible clue that something has happened); "he showed signs of strain"; "they welcomed the signs of spring" syn mark

2: a public display of a (usually written) message; "he posted signs in all the shop windows"

3: any communication that encodes a message; "signals from the boat suddenly stopped" syn signal, signaling

4: structure displaying a board on which advertisements can be posted; "the highway was lined with signboards" syn signboard

5: (astrology) one of 12 equal areas into which the zodiac is divided syn sign of the zodiac, star sign, mansion, house, planetary house

6: (medicine) any objective evidence of the presence of a disorder or disease; "there were no signs of asphixiation"

7: having an indicated pole (as the distinction between positive and negative electric charges); "he got the polarity of the battery reversed"; "charges of opposite sign" syn polarity

8: an event that is experienced as indicating important things to come; "he hoped it was an augury"; "it was a sign from God" syn augury, foretoken, preindication

9: a gesture that is part of a sign language 10: a fundamental linguistic unit linking a signifier to that which is signified; "The bond between the signifier and the signified is arbitrary"--de Saussure

11: a character indicating a relation between quantities; "don't forget the minus sign"

v 1: mark with one's signature; write one's name (on); "She signed the letter and sent it off"; "Please sign here" syn subscribe

2: approve and express assent, responsibility, or obligation; "All parties ratified the peace treaty"; "Have you signed your contract yet?" syn ratify

3: be engaged by a written agreement; "He signed to play the casino on Dec. 18"; "The soprano signed to sing the new opera"

4: engage by written agreement; "They signed two new pitchers for the next season" syn contract, sign on, sign up

5: communicate silently and non-verbally by signals or signs; "He signed his disapproval with a dismissive hand gesture"; "The diner signaled the waiters to bring the menu" syn signal, signalize, signalise

6: place signs, as along a road; "sign an intersection"; "This road has been signed"

7: communicate in sign language; "I don't know how to sign, so I could not communicate with my deaf cousin"

8: make the sign of the cross over someone in order to call on God for protection; consecrate syn bless

Source: WordNet. Princeton University