[ˈsɪɡnl], (Noun)

Definitions:
- a gesture, action, or sound that is used to convey information or instructions, typically by prearrangement between the parties concerned
(e.g: the firing of the gun was the signal for a chain of beacons to be lit)

- an electrical impulse or radio wave transmitted or received
(e.g: equipment for receiving TV signals)

- an apparatus on a railway, typically a coloured light or a semaphore, giving indications to train drivers of whether or not the line is clear
(e.g: the driver of the mail train overran a signal at danger and ran into the rear of an express)


Phrases:

Origin:
late Middle English: from Old French, from medieval Latin signale, neuter of late Latin signalis, from Latin signum ‘mark, token’ (see sign). The verb dates from the early 19th century

[ˈsɪɡnl], (Verb)

Definitions:
- convey information or instructions by means of a gesture, action, or sound
(e.g: hold your fire until I signal)


Phrases:

Origin:
late Middle English: from Old French, from medieval Latin signale, neuter of late Latin signalis, from Latin signum ‘mark, token’ (see sign). The verb dates from the early 19th century

[ˈsɪɡnl], (Adjective)

Definitions:
- striking in extent, seriousness, or importance; outstanding
(e.g: their signal failure to achieve a satisfactory solution to the problem)


Phrases:

Origin:
early 17th century: from French signalé, from the Italian past participle segnalato ‘distinguished, made illustrious’, from segnale ‘a signal’