religion
c.1200, "state of life bound by monastic vows," also "conduct indicating a belief in a divine power," from Anglo-Fr.
religiun (11c.), from O.Fr.
religion "religious community," from L.
religionem (nom.
religio) "respect for what is sacred, reverence for the gods," in L.L. "monastic life" (5c.); according to Cicero, derived from
relegare "go through again, read again," from
re- "again" +
legere "read" (see
lecture). However, popular etymology among the later ancients (and many modern writers) connects it with
religare "to bind fast" (see
rely), via notion of "place an obligation on," or "bond between humans and gods." Another possible origin is
religiens "careful," opposite of
negligens. Meaning "particular system of faith" is recorded from c.1300.
"To hold, therefore, that there is no difference in matters of religion between forms that are unlike each other, and even contrary to each other, most clearly leads in the end to the rejection of all religion in both theory and practice. And this is the same thing as atheism, however it may differ from it in name." [Pope Leo XIII, Immortale Dei, 1885]
Modern sense of "recognition of, obedience to, and worship of a higher, unseen power" is from 1530s.
Religious is first recorded early 13c. Transfered sense of "scrupulous, exact" is recorded from 1590s.