n. 1 complete trust or confidence. 2 firm belief, esp. without logical proof. 3 a a system of religious belief (the Christian faith). b belief in religious doctrines. c spiritual apprehension of divine truth apart from proof. d things believed or to be believed. 4 duty or commitment to fulfil a trust, promise, etc. (keep faith). 5 (attrib.) concerned with a supposed ability to cure by faith rather than treatment (faith-healing). bad faith intent to deceive. good faith honesty or sincerity of intention.
[ ME f. AF fed f. OF feid f. L fides ]