What is Maintainable?

Maintainable definition and meaning on Dictionary terms:
verb (used with object)
to keep in existence or continuance; preserve; retain: to maintain good relations with neighboring countries.
to keep in an appropriate condition, operation, or force; keep unimpaired: to maintain order; to maintain public highways.
to keep in a specified state, position, etc.: to maintain a correct posture; to maintain good health.
to affirm; assert; declare: He maintained that the country was going downhill.
to support in speech or argument, as a statement or proposition.
to keep or hold against attack: to maintain one’s ground.

to provide for the upkeep or support of; carry the expenses of: to maintain a family.
to sustain or support: not enough water to maintain life.