The Collaborative International Dictionary of English v.0.48:

Pal \Pal\, n. [Etymol. uncertain.]
   A mate; a partner; esp., an accomplice or confederate.
   [Slang]
   [1913 Webster]

WordNet (r) 3.0 (2006):

pal
    n 1: a close friend who accompanies his buddies in their
         activities [syn: buddy, brother, chum, crony,
         pal, sidekick]
    v 1: become friends; act friendly towards [syn: pal, pal up,
         chum up]

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

PAL

   1.  Paradox Application Language.

   2. For the AVANCE distributed persistent operating
   system.

   ["PAL Reference Manual", M. Ahlsen et al, SYSLAB WP-125,
   Stockholm 1987].

   ["AVANCE: An Object Management System", A. Bjornerstedt et al,
   SIGPLAN Notices 23(11):206-221 (OOPSLA '88) (Nov 1988)].

   [What is it?]

   3.  An object-oriented Prolog-like language.

   ["Inheritance Hierarchy Mechanism in Prolog", K. Akama, Proc
   Logic Prog '86, LNCS 264, Springer 1986, pp. 12-21].

   4.  PDP Assembly Language.

   5.  Pedagogic Algorithmic Language.

   6.  Programmable Array Logic.

   7.  phase alternating line.

   (2001-04-02)