set-in I. \ˈ ̷ ̷| ̷ ̷\adjective Etymology: from set in, past participle of set in 1.: placed, located, or built as a part of some other construction < set-in bookcase > < set-in wash basin > 2.: cut separately and stitched in < set-in sleeves > < set-in pocket > II. \ˈ ̷ ̷ˌ ̷ ̷\noun (-s) Etymology:set in 1.: an instance or time of something setting in < early set-in of frosty nights > 2.: something that is set in : insert