improvisation
noun
1 improvisation
A creation spoken or written or composed extemporaneously (without prior preparation).
Roget 674: non-preparation, absence of preparation, want of preparation; inculture†, inconcoction†, improvidence. immaturity, crudity; rawness etc. adj.; abortion; disqualification. [Absence of art] ... show more
Roget 612: impulse, sudden thought; impromptu, improvisation; inspiration, flash, spurt. improvisatore†; creature of impulse.
2 improvisation
An unplanned expedient.
synonym: temporary expedient.
3 improvisation
A performance given extempore without planning or preparation.
synonyms: extemporisation, extemporization.
Polish: improwizacja
Moby thesaurus: action, ad hoc measure, ad lib, ad-libbing, answer, arrangement, artifice, authorship, beginning, cadenza, coinage, conception, concoction, contrivance, contriving, countermove, coup, course of action, creation, creative effort ... show more.
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