signal

[1]	motion , indicate , gesture , gesticulate , communicate , announce , notify , whistle , wink , blink , nod , beckon , wave , sign
[2]	sign , signalize , signalise
[3]	bespeak , betoken , indicate , point

[1]	signaling , incitement , stimulus , sign , spur , impetus , goad , prick

adj.

[1]	remarkable , conspicuous , striking , extraordinary , unusual , unique , singular , special , noteworthy , notable , exceptional , significant , important , outstanding , momentous , consequential , weighty