prime

主要な、最良の、絶好の

最も優れている、最も重要な、または目的に特に適した様子。

やさしい英語で： 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.

類義語： excellent, main, ideal

よく使う表現： prime example, prime location, prime suspect, prime concern

素数の

一より大きく、一とその数自身でしか割り切れない整数を表す。

やさしい英語で： 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?

類義語： indivisible

反対語： composite

よく使う表現： prime number, prime factor, prime integer

最初の、第一の

時間や順序、体系の中で最初に来る様子。

やさしい英語で： 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.

類義語： first, initial, original

よく使う表現： prime meridian, prime mover, prime cause

全盛期、盛り

人の人生や物事の発展で、最も充実した時期。

やさしい英語で： 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.

使い方： 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.)

類義語： peak, heyday

よく使う表現： in someone’s prime, past someone’s prime, prime of life

素数

一より大きく、一とその数自身でしか割り切れない整数。

やさしい英語で： 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?

類義語： prime number

よく使う表現： a prime, odd prime, large prime

起爆剤、点火薬

何かを作動させる準備に使うもの。特に点火や爆発を始める物質。

やさしい英語で： 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.

類義語： primer

よく使う表現： a prime, powder prime, apply a prime

プライム

バックギャモンで、相手の駒の通過を防ぐ、連続した占有マス。

やさしい英語で： 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.

よく使う表現： build a prime, six-point prime, break a prime

プライム

測定や数学で、数字や文字の後に付ける記号′。

やさしい英語で： 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.

類義語： prime mark

よく使う表現： prime symbol, double prime, single prime