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prime

Meaning in simple English

US /praɪm/

prime means: Best, most important, or especially suitable for a purpose.

adjective

BEST OR MAINB2

Best, most important, or especially suitable for a purpose.

  • The shop is in a prime location.
  • Safety is our prime concern.
  • This is a prime example of careful planning.

Similar words: excellent, main, ideal

Common phrases: prime example, prime location, prime suspect, prime concern

TWO FACTORSB1

Describing a whole number greater than one that divides exactly only by one and itself.

  • Seven is a prime number.
  • Find the prime factors of twelve.
  • Is ninety-seven prime?

Similar words: indivisible

Opposites: composite

Common phrases: prime number, prime factor, prime integer

FIRST IN ORDERC2

Coming first in time, order, or a system.

  • The prime meridian passes through Greenwich.
  • The philosopher searched for a prime cause of all motion.
  • A prime mover starts the chain of events.

Similar words: first, initial, original

Common phrases: prime meridian, prime mover, prime cause

noun

BEST PERIODB2

The best part or period of someone’s life or of something’s development.

  • She is in her prime.
  • The player was past his prime.
  • He spent the prime of his career abroad.

How to use it: in someone’s prime (The singer was in her prime when she recorded this album.); past someone’s prime (The boxer is past his prime.)

Similar words: peak, heyday

Common phrases: in someone’s prime, past someone’s prime, prime of life

PRIME NUMBERB2

A whole number greater than one that divides exactly only by one and itself.

  • Two is the smallest prime.
  • The class listed all primes below twenty.
  • Can you find a larger prime?

Similar words: prime number

Common phrases: a prime, odd prime, large prime

PREPARING MATERIALC2

Something used to prepare another thing for use or action.

  • The gunner added a prime to the charge.
  • A damp prime failed to ignite.
  • The spark lit the prime first.

Similar words: primer

Common phrases: a prime, powder prime, apply a prime

BLOCKING ROWC2

In backgammon, a row of occupied spaces that stops the other player’s pieces from moving past.

  • She built a prime across six points.
  • His pieces were trapped behind the prime.
  • A lucky roll helped me break the prime.

Common phrases: build a prime, six-point prime, break a prime

MEASUREMENT MARKC1

The mark ′ used after numbers or letters in measurements and mathematics.

  • A prime after a number can mean feet.
  • Write a prime after the letter to mark its derivative.
  • Two primes can indicate a second derivative.

Similar words: prime mark

Common phrases: prime symbol, double prime, single prime

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