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Related to in use: value in use
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|Adj.||1.||in use - (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"|
occupied - held or filled or in use; "she keeps her time well occupied"; "the wc is occupied"
|2.||in use - currently being used; "robots are in use throughout industry"|
used - employed in accomplishing something; "the principle of surprise is the most used and misused of all the principles of war"- H.H.Arnold & I.C.Eaker