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life‧time
[countable usually singular]
[countable usually singular]1 the period of time during which someone is alive or something exists [↪ lifespan]
2 the best opportunity, experience etc that you will ever have : 
It was the holiday of a lifetime.
the chance/experience etc of a lifetime
It was the holiday of a lifetime.3 not at all [= never]: 'Would you go out with him after he dropped you?' 'Not in this lifetime.'
not in this lifetime
spoken'Would you go out with him after he dropped you?' 'Not in this lifetime.'
