na-adjective, noun
of paramount importance; essential; extremely important
Formal, somewhat literary word used to describe something that is absolutely necessary or of the highest importance. Often used in written or official contexts.
この問題の解決は至要である。
Solving this problem is of paramount importance.
安全対策は至要な課題だ。
Safety measures are an essential issue.
Compound of 至 (し, 'ultimate') and 要 (よう, 'essential'). The combination conveys the idea of something being of the highest necessity.