1) Crucial 2) Deciding 3) Decisive 4) Determinant 5) Determining 6) French word used in English 7) Serving to determine 1) Deciding 2) Decisive 3) Determinant 4) Determining 
A determinative, also known as a taxogram or semagram, is an ideogram used to mark semantic categories of words in logographic scripts which helps to disambiguate interpretation. They have no direct counterpart in spoken language, though they may derive historically from glyphs for real words, and functionally they resemble classifiers in East Asi...
• (n.) That which serves to determine. • (a.) Having power to determine; limiting; shaping; directing; conclusive.
(from the article `hieroglyphic writing`) In addition, determinatives—signs that do not represent a phonetic value but serve only to inform the reader as to the family of meanings to which ...
De·ter'mi·na·tive adjective [ Confer French déterminatif .] Having power to determine; limiting; shaping; directing; conclusive. « Incidents . . . determinative of their course.» I. Taylor. Determinative tables (Nat. Hist.) , 
serving to determine; determining.