プライム

noun, used as a prefix

prime-

Used as a prefix in loanword compounds to mean 'first', 'best', or 'primary', e.g., プライムタイム (prime time), プライムレート (prime rate).

• プライムタイムに放ほう送そうされる番ばん組ぐみは視し聴ちょう率りつが高たかい。

  Programs broadcast during prime time have high ratings.

• プライムレートが上あがると、住じゅう宅たくローンの金きん利りも上あがる。

  When the prime rate goes up, mortgage interest rates also rise.

noun

prime symbol (')

Refers to the typographical symbol (') used in mathematics, measurements, or as a diacritic; not a common standalone noun in everyday Japanese.

• 数すう学がくで、プライムは微び分ぶんを表あらわす記き号ごうとして使つかわれる。

  In mathematics, the prime symbol is used to denote differentiation.