1660s (trans.), from Latin ignitus, past participle of ignire "set on fire, make red hot," from ignis "fire" (see igneous). Attested earlier as an adjective (1550s). Intransitive sense from 1818. Related: Ignited; igniting.
Great heat can ignite almost any dry matter
Marsh gases ignited suddenly
The ostentatious way of living of the rich ignites the hatred of the poor