Determinative

[Sarah]

Having power to determine; limiting; shaping; directing;conclusive.Incidents . . . determinative of their course. I. Taylor.Determinative tables (Nat. Hist.), tables presenting the specificcharacter of minerals, plants, etc., to assist in determining thespecies to which a specimen belongs.

[Hina Muqadas]

Serving to define, qualify, or direct.

[AnthonynawoK]

a determining or causal element or factor