"draw out or lengthen in time," 1530s, a back-formation from protraction and in part from Latin protractus, past participle of protrahere "to draw forth, prolong." Etymologically identical with portray, which is the same Latin verb altered in passing through French. Related: Protracted; protracting. The English verb survived chiefly in the past-participle adjective.
Protracted meeting, a revival meeting continued or protracted ; a series of meetings of unusual importance, often lasting for several days and attended by large numbers ; chiefly used by Congregationalists, Methodists, and Baptists. [Century Dictionary]
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).