From Longman Dictionary of Contemporary Englishin a millionin a millioninformala)the best of all possible people or thingsShe’s a wife in a million.He’s so generous. He’s one in a million.b)used to show how unlikely something isIt was a chance in a million that we’d find a fossil. →million
Examples from the Corpus
a chance in a million• In fact they were saved by a chance in a million.• It was a chance in a million, and if he did not grasp it, one of his competitors would.