The Collaborative International Dictionary of English v.0.48:

mesa \me"sa\ (m[asl]"s[.a]), n. [Sp.]
   A high tableland; a plateau on a hill. [Southwestern U.S.]
   --Bartlett.
   [1913 Webster]

WordNet (r) 3.0 (2006):

mesa
    n 1: flat tableland with steep edges; "the tribe was relatively
         safe on the mesa but they had to descend into the valley
         for water" [syn: mesa, table]
    2: a city in Arizona just to the east of Phoenix; originally a
       suburb of Phoenix

The Free On-line Dictionary of Computing (19 January 2023):

Mesa

   Xerox PARC, 1977.  System and application programming for
   proprietary hardware: Alto, Dolphin, Dorado and Dandelion.
   Pascal-like syntax, ALGOL68-like semantics.  An early version
   was weakly typed.  Mesa's modules with separately compilable
   definition and implementation parts directly led to Wirth's
   design for Modula.  Threads, coroutines (fork/join),
   exceptions, and monitors.  Type checking may be disabled.
   Mesa was used internally by Xerox to develop ViewPoint, the
   Xerox Star, MDE, and the controller of a high-end copier.  It
   was released to a few universitites in 1985.  Succeeded by
   Cedar.

   ["Mesa Language Manual", J.G.  Mitchell et al, Xerox PARC,
   CSL-79-3 (Apr 1979)].

   ["Early Experience with Mesa", Geschke et al, CACM
   20(8):540-552 (Aug 1977)].