copula
noun /ˈkɒpjələ/
/ˈkɑːpjələ/
(also linking verb)
(grammar)- a verb such as be or become that connects a subject with the adjective or noun (called the complement) that describes itWord Originearly 17th cent.: from Latin, ‘connection, linking of words’, from co- ‘together’ + apere ‘fasten’.