c.1374 (implied in
augury), from L.
augur, a religious official in ancient Rome who foretold events by interpreting omens, perhaps originally meaning "an increase in crops enacted in ritual," in which case it probably is from Old L.
*augos (gen.
*augeris) "increase," and is related to
augere "increase" (see
augment). The more popular theory is that it is from L.
avis "bird," since flights, singing, and feeding of birds or entrails from bird sacrifices were an important part of divination (cf.
auspicious). The second element would be from
garrire "to talk." The verb is 1549, from the noun.