The Collaborative International Dictionary of English v.0.48:

Lat \Lat\ (l[a^]t), v. t.
   To let; to allow. [Obs.] --Chaucer.
   [1913 Webster] Lata

WordNet (r) 3.0 (2006):

lat
    n 1: a broad flat muscle on either side of the back [syn:
         latissimus dorsi, lat]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

LAT
       Local Area Transport (DEC)


The Free On-line Dictionary of Computing (30 December 2018):

LAT

   Local Area Transport