Lewis Short
(adverb) : pīlātim, 2. pila
* Pillar-wise, with pillars.
* Lit.: pilatim aedificia agere,Vitr. 6, 11, 4.
* 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.
Charlton T. Lewis, Charles Short, A Latin Dictionary