Lewis & Short

complexīvus, a, um, adj. [complector]; in gram., serving for connecting, conneclive, copulative: particula (atque), Gell. 10, 29 tit. (in the text itself, conexiva): conjunctis, Mart. Cap. 3, § 272.
Adv.: com-plexīvē: dicere, Cassiod. Hist. Eccl. 1, 1.