a wistful desire to return in thought or in fact to a former time in one's life, to one's home or homeland, or to one's family and friends; a sentimental yearning for the happiness of a former place or time:
the science or study of family descent
nearness in place, time, order, occurrence, or relation.
1580s, "apostate," probably (with change of suffix) from Sp. renegado, originally "Christian turned Muslim," from M.L. renegatus, prop. pp. of renegare "deny" (see renege). General sense of "turncoat" is from 1660s. The form renegate, directly from M.L., is attested in Eng. from late 14c.