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English definition of “prime”

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prime

adjective [before noun] uk   /praɪm/ us  
C2 main or most important: This is a prime example of 1930s architecture. the prime suspect in a murder investigation a prime source of evidence The president is a prime (= likely) target for the assassin's bullet. of the best quality: prime beef The hotel is in a prime location in the city centre.
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prime

noun [S] uk   /praɪm/ us  
the period in your life when you are most active or successful: This is a dancer in her prime. Middle age can be the prime of life if you have the right attitude. I suspect this cheese is past its prime.

prime

verb [T] uk   /praɪm/ us  
to tell someone something that will prepare them for a particular situation: I'd been primed so I knew not to mention her son. to cover the surface of wood with a special paint before the main paint is put on to make a bomb or gun ready to explode or fire
(Definition of prime from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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