Quinisext
/ˈkwɪnɪsɛkst/(also Quinisextum) Christian Church. historical
adjective
Designating an ecumenical council convoked by the emperor Justinian II at Constantinople in 692, also known as the Council in Trullo.
Origin
Mid 17th century; earliest use found in John Cosin (1595–1672), bishop of Durham. From post-classical Latin quinisexta from classical Latin quīnī five each, five + sextus sixth, translating Byzantine Greek or medieval Greek πενθέκτη (short for πενθέκτη σύνοδος Quinisext Council).