The Collaborative International Dictionary of English v.0.48:
Desitive \Des"i*tive\, a. Final; serving to complete; conclusive. [Obs.] "Desitive propositions." --I. Watts. [1913 Webster]The Collaborative International Dictionary of English v.0.48:
Desitive \Des"i*tive\, n. (Logic) A proposition relating to or expressing an end or conclusion. [Obs.] --I. Watts. [1913 Webster]