im·promp·tu 
(ĭm-prŏmpt, -ty)
(ĭm-prŏmpt, -ty)adj.
1. Prompted by the occasion rather than being planned in advance: an impromptu party.
2. Spoken, performed, done, or composed with little or no preparation; extemporaneous: a few impromptu remarks.
adv.
With little or no preparation; extemporaneously.
n.
1. Something, such as a speech, that is made or done extemporaneously.
2. Music A short composition, especially for the piano, performed in an offhand or extemporized style.
[French, from Latin in prōmptū, at hand : in, in; see IN-2 + prōmptū, ablative of prōmptus, readiness, from past participle of prōmere, to bring forth; see PROMPT.]
- posh
- poshly
- poshness
- posigrade
- posit
- position
- positional
- positionally
- positional notation
- position effect
- positioner
- position paper
- position vector
- positive
- positive law
- positively
- positiveness
- positivism
- positivist
- positivistic
- positivity
- posit on
- posit on (or upon)
- positron
- positron emission tomography