From Longman Dictionary of Contemporary Englishexit pollˈexit ˌpoll noun [countable] PPVthe activity of asking people how they have voted in an election in order to discover the likely result
Examples from the Corpus
exit poll• But then, nemesis: the exit poll, the Basildon result.From Longman Business Dictionaryexit pollˈexit poll a poll in which people are asked how they have voted in an election. The poll is taken before the result of the election is known, in order to discover its likely resultEarly exit polls suggested he was the clear winner. → poll 