Ex·tem·po·ra·ne·ous a. Composed, performed, or uttered on the spur of the moment, or without previous study; unpremeditated; off-hand; ad-lib; extempore; extemporary; as, an extemporaneous address or production. -- Ex*tem*po*ra*ne*ous*ly, adv. -- Ex*tem*po*ra*ne*ous*ness,n.
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