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adj.
adequate for practical use; especially sufficient in strength or numbers to accomplish something; "the party has a working majority in the House"; "a working knowledge of Spanish"
adj.
actively engaged in paid work; "the working population"; "the ratio of working men to unemployed"; "a working mother"; "robots can be on the job day and night"
adj.
designed for or adapted to a function or use; "functional education selects knowledge that is concrete and usable rather than abstract and theoretical"; "functional architecture"
adj.
(of facilities such as telephones or lavatories) unavailable for use by anyone else or indicating unavailability; (`engaged' is a British term for a busy telephone line); "her line is busy"; "receptionists' telephones are always engaged"; "the lavatory is in use"; "kept getting a busy signal"