You use prime to describe something that is most important in a situation.

You use prime to describe something that is of the best possible quality.

You use prime to describe an example of a particular kind of thing that is absolutely typical.

If someone or something is in their prime, they are at the stage in their existence when they are at their strongest, most active, or most successful.

If you prime someone to do something, you prepare them to do it, for example by giving them information about it beforehand.

If someone primes a bomb or a gun, they prepare it so that it is ready to explode or fire.