1550s, in grammar, of a verb, "formed to signify the desire for the action or condition denoted by the simple verb;" see desiderata + -ive. As a noun, "a desiderative verb," from 1751.
Entries linking to desiderative
desiderata n.
"things desired or desirable, that which is lacking or required," 1650s, plural of desideratum, Latin, literally "something for which desire is felt," noun use of neuter past participle of desiderare "to long for" (see desire (v.)).
A Latin word in English; other offshoots of the Latin verb were nativized in Middle English: desiderable "wished for, desired" (mid-14c.), also "worthy of being admired;" desideracioun "longing, yearning" (late 15c.); desiderantly "with ardent desire" (c. 1500). Also compare obsolete desiderate "feel a desire or longing for" (1640s).
-ive
word-forming element making adjectives from verbs, meaning "pertaining to, tending to; doing, serving to do," in some cases from Old French -if, but usually directly from Latin adjectival suffix -ivus (source also of Italian and Spanish -ivo). In some words borrowed from French at an early date it has been reduced to -y (as in hasty, tardy).