The Oxford Thesaurus An A-Z Dictionary of Synonyms - signaln.

1) See sign, 1, above. 2) incitement, stimulus, spur, impetus, goad, prick: The waving of the flag will be the signal to advance. --adj. 3) remarkable, conspicuous, striking, extraordinary, unusual, unique, singular, special, noteworthy, notable, exceptional, significant, important, outstanding, momentous, consequential, weighty: The British forces won a signal victory at Khartoum that day. Winning the competition is a signal accomplishment. --v. 4) motion, indicate, gesture, gesticulate, communicate, announce, notify; whistle, wink, blink, nod, beckon, wave, sign: When your turn comes, a clerk will signal you to approach the counter. Peter raised his hand as a request to leave the room and the teacher signalled his assent.