WordReference Random House Learner's Dictionary of American English © 2015
ex•tem•po•ra•ne•ous /ɪkˌstɛmpəˈreɪniəs/USA pronunciation adj. 

    spoken or performed without preparation;
    impromptu: an extemporaneous speech.
ex•tem•po•ra•ne•ous•ly,adv. See -temp-.

Collins Concise English Dictionary © HarperCollins Publishers::

extemporaneous /ɪkˌstɛmpəˈreɪnɪəs/, extemporary /ɪkˈstɛmpərərɪ -prərɪ/ adj
  1. spoken, performed, etc, without planning or preparation; impromptu; extempore
  2. done in a temporary manner; improvised

exˌtempoˈraneously, exˈtemporarily adv exˌtempoˈraneousness, exˈtemporariness n

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