Source : Webster's Revised Unabridged Dictionary (1913)

Suppositive \Sup*pos"i*tive\, a. [Cf. F. suppositif.]
   Including or implying supposition, or hypothesis; supposed.
   -- {Sup*pos"i*tive*ly}, adv. --Hammond.

Suppositive \Sup*pos"i*tive\, n.
   A word denoting or implying supposition, as the words if,
   granting, provided, etc. --Harris.