Sign  —n. 1 thing indicating a quality, state, future event, etc. (sign of weakness). 2 mark, symbol, etc. 3 gesture or action conveying an order etc. 4 signboard; signpost. 5 each of the twelve divisions of the zodiac. —v. 1 a (also absol.) Write (one's name) on a document etc. As authorization. B sign (a document) as authorization. 2 communicate by gesture (signed to me to come). 3 engage or be engaged by signing a contract etc. (see also sign on, sign up).  sign away relinquish (property etc.) By signing. Sign in 1 sign a register on arrival. 2 get (a person) admitted by signing a register. Sign off 1 end work, broadcasting, etc. 2 withdraw one's claim to unemployment benefit after finding work. Sign on 1 agree to a contract etc. 2 employ (a person). 3 register as unemployed. Sign out sign a register on departing. Sign up 1 engage (a person). 2 enlist in the armed forces. 3 enrol. [latin signum]