既 知(きち)

きち

noun

known, already known

formalabstract

1. known, already known

Something that is already known or established as fact.

それは既知(きち)の事実(じじつ)だ。

That is a known fact.

既知(きち)の問題(もんだい)については対策(たいさく)を立(た)てた。

We developed countermeasures for the known issues.

科学(かがく)の分野(ぶんや)では既知(きち)の理論(りろん)を土台(どだい)に新(あたら)しい研究(けんきゅう)が進(すす)む。

In the field of science, new research builds on established theories.

A formal word meaning already known or established. Functions as a no-adjective (modifies nouns with の). Common in academic, scientific, and technical writing.

Common collocations

既知(きち)の事実(じじつ) — a known fact
既知(きち)の問題(もんだい) — a known issue
既知(きち)の情報(じょうほう) — known information
既知(きち)の人物(じんぶつ) — a known person, an acquaintance

Similar words

未知(みち) — unknown (contrasting pair: 既知(きち) vs 未知(みち))

Usage

Most commonly used as a modifier before nouns: 既知(きち)の + noun. The 既知(きち)/未知(みち) pair is frequently used in academic and scientific contexts to distinguish between established and unknown information.

Related Words

Antonym: 未知(みち) (unknown)

general

Added 2026.3.27 11:09 · Revised 2026.9.2 13:01

19500/19828_kichi