- A period of prosperity or market activity
- (nautical) A spar extending the foot of a sail; a spar rigged outboard from a ship's side to which boats are secured in harbour
- A horizontal member of a crane or derrick, used for lifting.
- An abrupt, low-pitched sound, such as of an explosion. (The boom of the surf)
- A floating barrier across a harbour entrance used to obstruct the entry of an enemy
- (intransitive) To be prosperous.
Etymology: Onomatopoetic, except in the "horizontal member" senses, which derive from the Dutch for tree.
- Business was booming.
- (intransitive) To speak or make noise with an intense, low pitch.
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Full Definition of boom