Pilâtim, pen. pro. Aduerb. Vitrouius. One piller by an other: by or at euerie piller.
Lewis and Short: Latin dictionary
pīlātim, adv. [2. pila], pillar-wise, with pillars.I.Lit.: pilatim aedificia agere, Vitr. 6, 11, 4.—II.Transf., in milit. lang., in close bodies, in solid columns: sive pilatim, sive passim iter facere volebat, Asellio ap. Serv. ad Verg. A. 12, 121: pilatim exercitum duxi, Scaur. ib.; cf. 1. pilo, and, under it, pilatus.