First in importance, degree, or rank

• 1 is not a prime number.

  Tatoeba · Adelpa · CC BY 2.0 FR

• 2 is the only even prime number.

  Tatoeba · Adelpa · CC BY 2.0 FR

First in time, order, or sequence

First in excellence, quality, or value

Having exactly two integral factors: itself and unity (1 in the case of integers)rare

Such that if it divides a product, it divides one of the multiplicandsrare

Having its complement closed under multiplicationrare

Such that the annihilator of any nonzero submodule is equal to the annihilator of the whole modulerare

Marked or distinguished by the prime symbolrare

Early; blooming; being in the first stagerare

Lecherous, lewd, lustfulrare

The early morning generally

• Tom is in the prime of his life.

  Tatoeba · CK · CC BY 2.0 FR

• She is 35 years old and in the prime of life.

  Tatoeba · CM · CC BY 2.0 FR

The earliest stage of something

The most active, thriving, or successful stage or period

The chief or best individual or part

Something which is first in importance or rank: a prime defense company, mortgage lender, etc