Twinning is defined as the process of giving birth to or having two offspring at the same time or as a process of pairing or combining two identical or similar things. The antonyms for twinning are separating, dividing, splitting, differentiating, and diversifying. These words indicate the opposite of the act of uniting or combining two or more entities. Separating means breaking apart or disconnecting the connected things, while dividing refers to sharing or separating into parts. Splitting refers to breaking or separating into pieces, while differentiating means distinguishing entities based on their characteristics. Diversifying means making entities vary in character or form, unlike twinning as a process of replicating the same thing twice.