To hold in an existing state or condition; keep in existence or continuance; preserve from lapse, decline, failure, or cessation; keep up: as, to maintain an upright attitude; to maintain a conversation.To furnish means for the subsistence or existence of; sustain or assist with the means of livelihood; provide for; support: as, to maintain a family or an army; to maintain a costly equipage.To hold fast; keep in possession; preserve from capture or loss: as, to maintain one's ground in battle or in argument; to maintain an advantage.To give support or encouragement to; uphold; countenance; vindicate, as by defense or adjudication.To uphold by argument or assertion; hold to: as, to maintain the doctrine of the Trinity.To represent; denote.Synonyms and Defend, Vindicate, etc. See assert.To behave; conduct one's self.2. To hold as true; hold.