Webster's 1828 Dictionary
DETERMINING
ppr. Ending; deciding; fixing; settling; resolving; limiting; directing.
Oxford Dictionary
determining
de ¦ter |min ¦ing |dɪˈtɜːmɪnɪŋ | ▶adjective causing something to occur or be done in a particular way; serving to decide something: money may have been the determining factor in his decision.
American Oxford Thesaurus
determining
determining adjective money is the determining factor: deciding, decisive, conclusive, final, definitive, key, pivotal, crucial, critical, major, chief, prime.
Oxford Thesaurus
determining
determining adjective the size of your house may be the determining factor: deciding, decisive, conclusive, final, settling, definitive, key, pivotal, crucial, critical, most influential, significant, major, chief, principal, prime, paramount.