Search Result for "extemporisation": 
Wordnet 3.0

NOUN (1)

1. a performance given extempore without planning or preparation;
[syn: extemporization, extemporisation, improvisation]



WordNet (r) 3.0 (2006):

extemporisation
    n 1: a performance given extempore without planning or
         preparation [syn: extemporization, extemporisation,
         improvisation]