twinning

== English == === Etymology === From twin +‎ -ing. === Verb === twinning present participle and gerund of twin === Noun === twinning (plural twinnings) The act of producing twins. The act of giving birth to twins. The pairing of similar objects (such as towns). (crystallography) The formation of twin crystals. (paraphilia) A type of identity transformation where a subject transforms into a copy or clone of someone else. (transport) The conversion of a road into a dual carriageway. ==== Derived terms ==== === Adjective === twinning (not comparable) Producing two offspring from one pregnancy. Synonym: biparous === See also === gemination twining