既知(きち)

きち
noun
known, already known
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

OPPOSITE:

  • 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 2026.4.11 10:25
19500/19828_kichi