Source : Webster's Revised Unabridged Dictionary (1913)

Prolog \Pro"log\, n. & v.
   Prologue.

Source : WordNet®

Prolog
     n : a computer language designed in Europe to support natural
         language processing [syn: {logic programing}, {logic
         programming}]

Source : Free On-Line Dictionary of Computing

Prolog
     
         Programming in Logic or (French) Programmation
        en Logique.  The first of the huge family of {logic
        programming} languages.
     
        Prolog was invented by Alain Colmerauer and Phillipe Roussel
        at the University of Aix-Marseille in 1971.  It was first
        implemented 1972 in {ALGOL-W}.  It was designed originally for
        {natural-language processing} but has become one of the most
        widely used languages for {artificial intelligence}.
     
        It is based on {LUSH} (or {SLD}) {resolution} {theorem
        proving} and {unification}.  The first versions had no
        user-defined functions and no control structure other than the
        built-in {depth-first search} with {backtracking}.  Early
        collaboration between Marseille and Robert Kowalski at
        {University of Edinburgh} continued until about 1975.
     
        Early implementations included {C-Prolog}, {ESLPDPRO},
        {Frolic}, {LM-Prolog}, {Open Prolog}, {SB-Prolog}, {UPMAIL
        Tricia Prolog}.  In 1998, the most common Prologs in use are
        {Quintus Prolog}, {SICSTUS Prolog}, {LPA Prolog}, {SWI
        Prolog}, {AMZI Prolog}, {SNI Prolog}.
     
        {ISO} draft standard at {Darmstadt, Germany
        (ftp://ftp.th-darmstadt.de/pub/programming/languages/prolog/standard/)}.
        or {UGA, USA (ftp://ai.uga.edu/ai.prolog.standard)}.
     
        See also {negation by failure}, {Kamin's interpreters},
        {Paradigms of AI Programming}, {Aditi}.
     
        A Prolog {interpreter} in {Scheme}.
        {(ftp://cpsc.ucalgary.ca/pub/prolog1.1)}.
     
        {A Prolog package
        (ftp://cpsc.ucalgary.ca/pub/prolog1.1/prolog11.tar.Z)} from
        the {University of Calgary} features {delayed goals} and
        {interval arithmetic}.  It requires {Scheme} with
        {continuations}.
     
        ["Programming in Prolog", W.F. Clocksin & C.S. Mellish,
        Springer, 1985].
     
        (2001-04-01)

Prolog++
     
        (After {C++}) {Prolog} with {object-oriented} features added
        by Phil Vasey of {Logic Programming Associates}.  Prolog++ is
        available for {MS-DOS} and the {X Window System}.  It is
        distributed by {AI International} Ltd. in England and by
        {Quintus}.