moderator

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun any substance used to slow down neutrons in nuclear reactors
  2. noun in the Presbyterian church, the officer who presides over a synod or general assembly
  3. noun someone who presides over a forum or debate

Etymology

Learned borrowing from Latin moderātor. First attested as Middle English moderatour. By surface analysis, moderate + -or.

In classic literature

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