1》 a gesture, action, or sound conveying information or an instruction.
2》 an indication of a state of affairs.
3》 an event or statement that provides the impulse or occasion for something to happen.
4》 a light or semaphore on a railway, giving indications to train drivers of whether or not to proceed.
5》 Bridge a prearranged convention of bidding or play intended to convey information to one's partner.
6》 an electrical impulse or radio wave transmitted or received.
■ verb ( ~s , ~ling , ~led ; US ~s , ~ing , ~ed )
1》 transmit a ~.
2》 instruct or indicate by means of a ~.
ME: from OFr., from med. L. ~e , neut. of late L. ~is , from L. signum (see sign ).
■ adjective striking in extent, seriousness, or importance.
C17: from Fr. ~é , from the Ital. past participle segnalato 'distinguished', from segnale 'a ~'.