The word yajna has its root in the Sanskrit meaning 'to worship, adore, honour, revere' and appears in the early Vedic literature, composed in 2nd millennium BCE. In Rigveda, Yajurveda (itself a derivative of this root) and others, it means "worship, devotion to anything, prayer and praise, an act of worship or devotion, a form of offering or oblation, and sacrifice". In post-Vedic literature, the term meant any form of rite, ceremony or devotion with an actual or symbolic offering or effort.

A yajna included major ceremonial devotions,