adjective having ones attention or mind or energy engaged.
— synonyms: occupied
adjective involved in military hostilities.
adjective reserved in advance.
— synonyms: booked, set-aside(p)
adjective (of facilities such as telephones or lavatories) unavailable for use by anyone else or indicating unavailability.
— synonyms: busy, in_use(p)
adjective (used of toothed parts or gears) interlocked and interacting.
— synonyms: meshed, intermeshed