maintainv. t.[OE. maintenen, F. maintenir, properly, to hold by the hand; main hand (L. manus) + F. tenir to hold (L. tenere). See Manual, and Tenable.]1. To hold or keep in any particular state or condition; to support; to sustain; to uphold; to keep up; not to suffer to fail or decline; as, to maintain a certain degree of heat in a furnace; to maintain a fence or a railroad; to maintain the digestive process or powers of the stomach; to maintain the fertility of soil; to maintain present reputation.()2. To keep possession of; to hold and defend; not to surrender or relinquish.()God values . . . every one as he maintains his post. (Grew.)3. To continue; not to suffer to cease or fail.()Maintain talk with the duke. (Shak.)4. To bear the expense of; to support; to keep up; to supply with what is needed.()Glad, by his labor, to maintain his life. (Stirling.)What maintains one vice would bring up two children. (Franklin.)5. To affirm; to support or defend by argument.()It is hard to maintain the truth, but much harder to be maintained by it. (South.)()