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