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Pronunciation of 

extemporaneous

view main entry for extemporaneousadjective formal  /ɪkˌstempəˈreɪniəs/
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derived words

extemporaneously

adverb

extemporaneousness

noun [uncountable]
extemporaneousness noun [uncountable]Not planned: random, arbitrary, spontaneous, accidental, instinctive, involuntary, unintended, impromptu, coincidental, by accident

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a method of financial trading in which share prices are hidden and not openly available to the public

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