A prescheduled time when a system can be taken off-line for maintenance, if necessary.

Retaining proper functionality over long periods of time with little or no maintenance. / (figuratively) Of a person: self-sufficient and not requiring much attention.

(of a system) Requiring a high degree of maintenance to ensure proper functioning, and without which it is likely to break down.

(nautical) The tallest mast of a sailing ship that has more than one mast; particularly a full-rigged ship.

(horology) The principal spring of a clockwork mechanism, which drives it by uncoiling. / (figuratively) The most important reason for, or element of, something.

Normal, principal or standard. / (rail transport) Of or pertaining to the principal route or line of a railway.

(slang) To inject (a drug) directly into a vein. / (by extension, informal, transitive) To consume voraciously.

(aviation) An airline's main operating unit, as opposed to codeshares or regional subsidiaries. / (rail transport) The principal route or line of a railway.

The ease with which something can be maintained.

(chiefly in combination) Able to be maintained