From Latin 'ignis' (fire), from PIE *h₁égni- — the same root that gave Sanskrit its fire god Agni.
To catch fire or cause to catch fire; to arouse or inflame an emotion or situation.
From Latin 'ignītus,' past participle of 'ignīre' (to set on fire), from 'ignis' (fire). The Latin 'ignis' derives from PIE *h₁égni- (fire), one of the best-reconstructed PIE roots, with cognates in Sanskrit 'agní' (fire, the fire god Agni), Lithuanian 'ugnìs' (fire), and Old Church Slavonic 'ognĭ' (fire). The English word is a learned borrowing that arrived in the seventeenth century, joining the older Germanic 'fire' in the English vocabulary. Key
The Hindu fire god Agni and the Latin word 'ignis' are cognates — both descend from the same PIE root *h₁égni-. Agni is one of the most important deities in the Rigveda, the oldest Hindu scripture, where he serves as the messenger between humans and gods because fire carries offerings upward. The PIE-speaking peoples evidently
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