The Collaborative International Dictionary of English v.0.48:
Approbative \Ap"pro*ba*tive\, a. [Cf. F. approbatif.] Approving, or implying approbation. --Milner. [1913 Webster]WordNet (r) 3.0 (2006):
approbative adj 1: expressing or manifesting praise or approval; "approbative criticism"; "an affirmative nod" [syn: approving, affirmative, approbative, approbatory, plausive]