lockable

The word "lockable" is a modern English formation built from the native Germanic verb "lock" and the productive Latinate suffix "-able". The root "lock" originates from the Old English loc, which referred to a fastening mechanism, a bolt, or an enclosed space, and is related to the action of securing something. The suffix "-able", entering English via Old French from Latin -abilis, is used to create adjectives meaning "capable of undergoing the action of the verb". Therefore, the literal construction "capable of being locked" directly and transparently conveys its modern meaning, describing an object designed or fitted with a mechanism to be secured.

Structure: lock (verb) + able (adjective suffix) - lock: From Old English loc (fastening, enclosure), of Germanic origin. - able: From Latin -abilis, a suffix forming adjectives meaning "capable of, fit for, tending to".