sign (Noun) — A perceptible indication of something not immediately apparent (as a visible clue that something has happened). ex. "they welcomed the signs of spring" ex. "he showed signs of strain"
sign (Noun) — A public display of a message. ex. "he posted signs in all the shop windows"
sign (Noun) — Any nonverbal action or gesture that encodes a message.
sign (Noun) — Structure displaying a board on which advertisements can be posted. ex. "the highway was lined with signs"
sign (Noun) — (astrology) one of 12 equal areas into which the zodiac is divided.
sign (Noun) — (medicine) any objective evidence of the presence of a disorder or disease. ex. "there were no signs of asphyxiation"
sign (Noun) — Having an indicated pole (as the distinction between positive and negative electric charges). ex. "charges of opposite sign"
sign (Noun) — An event that is experienced as indicating important things to come. ex. "it was a sign from God"
sign (Noun) — A gesture that is part of a sign language.
sign (Noun) — (linguistics) a fundamental linguistic unit linking a signifier to that which is signified.
sign (Noun) — A character indicating a relation between quantities. ex. "don't forget the minus sign"
sign (Verb) — Mark with one's signature; write one's name (on). ex. "She signed the letter and sent it off" ex. "Please sign here"
sign (Verb) — Approve and express assent, responsibility, or obligation. ex. "Have you signed your contract yet?"
sign (Verb) — Be engaged by a written agreement. ex. "He signed to play the casino on Dec. 18" ex. "The soprano signed to sing the new opera"
sign (Verb) — Engage by written agreement. ex. "They signed two new pitchers for the next season"
sign (Verb) — Communicate silently and non-verbally by signals or signs. ex. "He signed his disapproval with a dismissive hand gesture"
sign (Verb) — Place signs, as along a road. ex. "sign an intersection" ex. "This road has been signed"
sign (Verb) — Communicate in sign language. ex. "I don't know how to sign, so I could not communicate with my deaf cousin"
sign (Verb) — Make the sign of the cross over someone in order to call on God for protection; consecrate.
sign (Adjective) — Used of the language of the deaf.