Lewis & Short

2. collātus (conl-), ū s, m. [confero], a bringing together (perh. only in the foll. exs.; only in the abl.).

  1. I. Of weapons in war, i.e. an attack: in collatu, in the affray, Auct. B. Hisp. 31.
  2. II. A contributing, trop., to knowledge, teaching: alicujus collatu aliquid discere, Censor. de Die Nat. 1, 8.