ignite

Concise Oxford English Dictionary © 2008 Oxford University Press:
ignite /ɪgˈnʌɪt/

▶verb

• 1 catch fire or cause to catch fire.

• 2 provoke or inflame (an emotion or situation).

– derivatives
ignitability noun,
ignitable adjective.

– origin C17: from L. ignire ‘set on fire’, from ignis ‘fire’.