GRE TOEFL combustion Definition The process of burning something, typically with flame and heat. Example "The engine runs on internal combustion." Sign in to save GRE Quiz → TOEFL Quiz → ← combustible comedy → Study tips featuring "combustion" Group Words Together by Emotional Tone Map Each Word Into a Connected Network Force Contrast Between Two Similar Words Related words GRE awe GRE smithereens GRE abacus SAT abase GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate SAT abdomen GRE abduct GRE aberrant