The Collaborative International Dictionary of English v.0.48:

Message \Mes"sage\, v. t.
   To bear as a message. [Obs.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Message \Mes"sage\, n. [OE., fr. OF. message, fr. LL.
   missaticus. See 1st Message.]
   A messenger. [Obs.] --Chaucer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Message \Mes"sage\ (?; 48), n. [F., fr. LL. missaticum, fr. L.
   mittere, missum, to send. See Mission, and cf.
   Messenger.]
   1. Any notice, word, or communication, written or verbal,
      sent from one person to another.
      [1913 Webster]

            Ehud said, I have a message from God unto thee.
                                                  --Judg. iii.
                                                  20.
      [1913 Webster]

   2. Hence, specifically, an official communication, not made
      in person, but delivered by a messenger; as, the
      President's message.
      [1913 Webster]

   Message shell. See Shell.
      [1913 Webster]

WordNet (r) 3.0 (2006):

message
    n 1: a communication (usually brief) that is written or spoken
         or signaled; "he sent a three-word message"
    2: what a communication that is about something is about [syn:
       message, content, subject matter, substance]
    v 1: send a message to; "She messaged the committee"
    2: send as a message; "She messaged the final report by fax"
    3: send a message; "There is no messaging service at this
       company"

Moby Thesaurus II by Grady Ward, 1.0:

182 Moby Thesaurus words for "message":
   ALGOL, COBOL, ESP, FORTRAN, acceptation, account, acknowledgment,
   acquaintance, address, advice, alphabetic data, alphanumeric code,
   angular data, announcement, answer, assembler, bearer, billet,
   binary digit, binary scale, binary system, bit, blue book,
   briefing, bug, bulletin, business letter, byte, carrier, chit,
   command pulses, commands, commerce, communication, communion,
   communique, compiler, computer code, computer language,
   computer program, congress, connection, contact, control signals,
   controlled quantity, conversation, converse, correcting signals,
   correspondence, courier, data, datum, dealing, dealings,
   declaration, directive, directory, dispatch, dispatcher, embassy,
   emissary, enlightenment, envoy, epistle, error, error signals,
   essence, evidence, exchange, express, facts, factual information,
   familiarization, favor, feedback pulses, feedback signals,
   film data, gen, general information, go-between, guidebook,
   handout, hard information, herald, hexadecimal system, idea,
   implication, import, incidental information, info, information,
   input data, input quantity, instruction, instructions,
   intelligence, intendment, interaction, interchange,
   intercommunication, intercommunion, intercourse, intermediary,
   internuncio, interplay, knowledge, letter, light, line,
   linguistic intercourse, machine language, meaning, mediator, memo,
   memorandum, mention, messenger, missive, multiple messages, news,
   noise, note, notice, notification, numeric data, octal system,
   oscillograph data, output data, output quantity, play,
   pneumatogram, point, polar data, post, presentation,
   promotional material, proof, publication, publicity,
   punch-card data, purport, random data, rectangular data,
   reference quantity, release, reply, report, rescript, response,
   ruly English, sense, sidelight, signals, significance,
   significancy, signification, single messages, social intercourse,
   speaking, speech, speech circuit, speech situation, statement,
   talking, telegram, telepathy, the dope, the goods, the know,
   the scoop, tidings, touch, traffic, transmission, truck,
   two-way communication, understanding, unorganized data,
   visible-speech data, white book, white paper, word



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

message

   In object-oriented programming sending a message to an
   object (to invoke a method) is equivalent to calling a
   procedure in traditional programming languages, except that
   the actual code executed may only be selected at run time
   depending on the class of the object.  Thus, in response to
   the message "drawSelf", the method code invoked would be
   different if the target object were a circle or a square.

   (1995-02-16)