Impromptu definition

ĭm-prŏmpto͝o, -tyo͝o
(music) A short composition, especially for the piano, performed in an offhand or extemporized style.
noun
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5
Without preparation or advance thought; offhand.
adjective
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An impromptu speech, performance, etc.
noun
10
6
Spoken, performed, done, or composed with little or no preparation; extemporaneous.

A few impromptu remarks.

adjective
5
3
With little or no preparation; extemporaneously.
adverb
2
1
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(music) A short musical composition for an informal occasion often with the character of improvisation and usually to be played solo.
noun
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The definition of impromptu is something done without advance thought or without a plan.

When everyone gets together and decides to throw a party at the spur of the moment, this is an example of an impromptu party.

adjective
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The party began with an impromptu rendition of 'Happy Birthday'.

adjective
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Any composition, musical or otherwise, that is created on the spot without preparation.
noun
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Prompted by the occasion rather than being planned in advance.

An impromptu party.

adjective
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2
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Something, such as a speech, that is made or done extemporaneously.
noun
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Other Word Forms

Noun

Singular:
impromptu
Plural:
impromptus

Origin of impromptu

  • French from Latin in prōmptū at hand in in in–2 prōmptū ablative of prōmptus readiness from past participle of prōmere to bring forth prompt

    From American Heritage Dictionary of the English Language, 5th Edition

  • Borrowing from French impromptu

    From Wiktionary