Real Dictionary

rev
verb: When the engine of a vehicle revs, or when you rev it, the engine speed is increased as the accelerator is pressed.

Rev in American English
Revelation
intransitive verb: to accelerate; become revved
noun: a revolution (in an engine or the like)
transitive verb: to accelerate sharply the speed of (an engine or the like)

rev in American English 1
a revolution, as of the crankshaft of an engine
to increase the revolutions per minute of (an engine, motor, etc.)
to undergo revving

rev in American English 2
revenue

rev in British English
noun: revolution per minute
verb: to increase the speed of revolution of (an engine)

Rev.
Rev. is a written abbreviation for Reverend.

rev. in American English
abbreviation: Revelation; Revelations
abbreviation: revenue

rev. in British English
abbreviation for: Revelation
abbreviation for: revenue