The Collaborative International Dictionary of English v.0.48:
Conceptive \Con*cep"tive\, a. [Cf. F. conceptif, L. conceptivus.] Capable of conceiving. --Sir T. Browne [1913 Webster]WordNet (r) 3.0 (2006):
conceptive adj 1: capable of conceiving [syn: conceptive, impregnable]