1. 
[syn: subordinating(a), subordinative]
The Collaborative International Dictionary of English v.0.48:
Subordinative \Sub*or"di*na*tive\, a.
   Tending to subordinate; expressing subordination; used to
   introduce a subordinate sentence; as, a subordinative
   conjunction.
   [1913 Webster]
WordNet (r) 3.0 (2006):
subordinative
    adj 1: serving to connect a subordinate clause to a main clause;
           "`when' in `I will come when I can' is a subordinating
           conjunction" [syn: subordinating(a), subordinative]
           [ant: coordinating(a), coordinative]