definitive

adjectives

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