impromptu


Concise Oxford English Dictionary © 2008 Oxford University Press:
impromptu /ɪmˈprɒm(p)tjuː/
adjective & adverb unplanned or unrehearsed. noun (pl. impromptus) a short piece of instrumental music, especially a solo, reminiscent of an improvisation.
– origin C17 (as adv.): from Fr., from L. in promptu ‘in readiness’, from promptus (see prompt).
'impromptu' also found in these Oxford entries:

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