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impromptu

im·promp·tu [ im prómp t ]


adjective 
Definition:
 
done spontaneously: not prepared or planned in advance
an impromptu speech



adverb 
Definition:
 
without prior preparation: in an unrehearsed way



noun  (plural im·promp·tus)
Definition:
 
1. short solo piece: a short piece of instrumental music whose style gives an impression of improvisation. Such pieces were a highly developed and popular form in the 19th century.

2. spontaneous or unrehearsed act: something done or said without planning

[Mid-17th century. Via French< Latin in promptu "at hand" < promptus (see prompt)]
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