1. (adj)definitive, unequivocal clearly defined or formulated "the plain and unequivocal language of the laws"- R.B.Taney
2. (adj)authoritative, classical, classic, definitive of recognized authority or excellence "the definitive work on Greece"; "classical methods of navigation"
3. (adj)definitive, determinate supplying or being a final or conclusive settlement "a definitive verdict"; "a determinate answer to the problem"