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Definition of brain

brain

/breɪn/
brain

Plural:brains
•
Adjective:brainy
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Past Simple:brained
•
Past Participle:brained
•
Present Participle:braining
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brain Lexical Profile

brain Game Scores & Validity

• noun

1

An organ of soft nervous tissue contained within the skull of vertebrates, functioning as the coordinating center of sensation, movement, and intellectual and nervous activity.

Example

"The human brain processes vast amounts of sensory information every second."


2

Intellectual capacity, mental acuity, or high intelligence (often used in the plural).

Example

"Solving this complex engineering problem will require both patience and brains."


3

An exceptionally intelligent person, or the chief planner and organizer of a group or enterprise.

Example

"She was the chief brain behind the company's successful international expansion."

Synonyms
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Antonyms
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• verb

1

To hit or strike someone hard on the head with a heavy object (informal).

Example

"The low-hanging wooden beam nearly brained him as he walked into the old cellar."

Synonyms
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• Rhymes for brain

Word Origin & Etymology

From Old English brægn, of West Germanic origin, related to Middle Dutch brein and possibly ultimately derived from a Proto-Indo-European root meaning 'top of the head' or 'skull'.

Cite this Entry


Wordmom. (2026). Definition of Brain. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/brain
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