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]

Moby Thesaurus II by Grady Ward, 1.0:

75 Moby Thesaurus words for "pal":
   ace, amigo, associate, associate with, assort with, bedfellow,
   bedmate, bosom buddy, buddy, bunkie, bunkmate, butty, camarade,
   chamberfellow, chum, chum together, chum with, classmate, clique,
   clique with, club together, colleague, comate, companion, company,
   compeer, comrade, confrere, consociate, consort, consort with,
   copartner, crony, fellow, fellow student, fellowship,
   flock together, fraternize, girl friend, gossip, hang around with,
   hang out with, herd together, hobnob with, join,
   join in fellowship, keep company with, mate, messmate, mingle with,
   mix with, old crony, pal up with, pal with, pard, pardner, partner,
   playfellow, playmate, roommate, run, run in couples, run with,
   schoolfellow, schoolmate, shipmate, side partner, sidekick,
   sort with, take up with, teammate, tie up with, workfellow,
   yokefellow, yokemate



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

PAL
       Paradox Application Language (Borland, DB)


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

PAL
       Phase Alternating Line


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

PAL
       Privileged Architecture Library (DEC, Alpha)


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

PAL
       Processor Abstraction Layer


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

PAL
       Programmable Array Logic


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

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)