1. [ noun ] someone who presides over a forum or debate
Related terms: presiding_officer moderate
2. [ noun ] (physics,nuclear physics) any substance used to slow down neutrons in nuclear reactors
Related terms: inhibitor heavy_water nuclear_reactor
3. [ noun ] in the Presbyterian church, the officer who presides over a synod or general assembly
Related terms: presiding_officer
4. [ noun ] someone who mediates disputes and attempts to avoid violence
Related terms: mediator modifier chasten
Similar spelling:   moderato