一いっ定てい期き間かん

noun, adverb

fixed period; fixed interval

Refers to a set, unchanging length of time. Often used in legal, business, or scheduling contexts.

• この契けい約やくは一いっ定てい期き間かんごとに更こう新しんされます。

  This contract is renewed at fixed intervals.

• 一いっ定てい期き間かん、海かい