Compounding is a highly productive word formation process in TİD. In compounding, two signs are combined as a new unit that is realized as a single lexical item. The signs that make up a compound can appear in an utterance on their own. When inside a compound, these can be reduced or they can be expressed in full form. The various categories of compounding in TİD are further explained below in terms of the phonological, syntactic, and semantic relations of the parts.