(chemistry) The act or process of burning. / A process where two chemicals are combined to produce heat. / A process wherein a fuel is combined with oxygen, usually at high temperature, releasing heat.

plural of combustion

Capable of burning. / (figuratively, dated) Easily kindled or excited; quick; fiery; irascible.

A material that is capable of burning.

To burn; to catch fire. / (intransitive, figuratively) To erupt with enthusiasm or boisterousness.

(obsolete) Burnt. / (astrology) In close conjunction with the sun (so that its astrological influence is "burnt up"), sometimes specified to be within 8 degrees 30'.

(obsolete) That which undergoes burning.

Third-person singular simple present indicative form of combust

simple past tense and past participle of combust

present participle of combust