理論(りろん)

りろん
noun
theory
1. theory; principle
A systematic set of ideas explaining phenomena, based on reasoning and evidence.
その理論(りろん)は実験(じっけん)で証明(しょうめい)された。
That theory was proven by experiment.
理論(りろん)と実践(じっせん)は違(ちが)う。
Theory and practice are different.
彼(かれ)の理論(りろん)は正(ただ)しいと思(おも)う。
I think his theory is correct.

理論(りろん) is a compound: 理(り) (reason/principle) + 論(ろん) (argument/discourse).

COMMON TYPES:

  • 経済(けいざい)理論(りろん) (economic theory)
  • 相対性(そうたいせい)理論(りろん) (theory of relativity)
  • 進化(しんか)理論(りろん) (evolutionary theory)

COMMON COLLOCATIONS:

  • 理論(りろん)を立(た)てる (to formulate a theory)
  • 理論(りろん)に基(もと)づく (to be based on theory)
  • 理論的(りろんてき)（な） (theoretical)
  • 理論(りろん)武装(ぶそう) (theoretical preparation)

CONTRAST:

  • 理論(りろん) (theory - systematic explanation)
  • 仮説(かせつ) (hypothesis - proposed explanation to be tested)
  • 法則(ほうそく) (law - established principle)
general
Added 2026.1.16 8:13 · Revised 2026.1.19 21:17
04500/04708_riron