Source : Webster's Revised Unabridged Dictionary (1913)

Express \Ex*press"\ ([e^]ks*pr[e^]s"), a. [F. expr[`e]s, L.
   expressus, p. p. of exprimere to express; ex. out + premere
   To press. See {Press}.]
   1. Exactly representing; exact.

            Their human countenance The express resemblance of
            the gods.                             --Milton.

   2. Directly and distinctly stated; declared in terms; not
      implied or left to inference; made unambiguous by
      intention and care; clear; not dubious; as, express
      consent; an express statement.

            I have express commandment.           --Shak.

   3. Intended for a particular purpose; relating to an express;
      sent on a particular errand; dispatched with special
      speed; as, an express messenger or train. Also used
      adverbially.

            A messenger sent express from the other world.
                                                  --Atterbury.

   {Express color}. (Law) See the Note under {Color}, n., 8.

   Syn: Explicit; clear; unambiguous. See {Explicit}.

Express \Ex*press"\, v. t. [imp. & p. p. {Expressed}; p. pr. &
   vb. n. {Expressing}.] [Cf. OF. espresser, expresser, L.
   exprimere, expressum. See {Express}, a.; cf. {Sprain}.]
   1. To press or squeeze out; as, to express the juice of
      grapes, or of apples; hence, to extort; to elicit.

            All the fruits out of which drink is expressed.
                                                  --Bacon.

            And th'idle breath all utterly expressed. --Spenser.

            Halters and racks can not express from thee More
            than by deeds.                        --B. Jonson.

   2. To make or offer a representation of; to show by a copy or
      likeness; to represent; to resemble.

            Each skillful artist shall express thy form. --E.
                                                  Smith.

            So kids and whelps their sires and dams express.
                                                  --Dryden.

   3. To give a true impression of; to represent and make known;
      to manifest plainly; to show in general; to exhibit, as an
      opinion or feeling, by a look, gesture, and esp. by
      language; to declare; to utter; to tell.

            My words express my purpose.          --Shak.

            They expressed in their lives those excellent
            doctrines of morality.                --Addison.

   4. To make known the opinions or feelings of; to declare what
      is in the mind of; to show (one's self); to cause to
      appear; -- used reflexively.

            Mr. Phillips did express with much indignation
            against me, one evening.              --Pope.

   5. To denote; to designate.

            Moses and Aaron took these men, which are expressed
            by their names.                       --Num. i. 17.

   6. To send by express messenger; to forward by special
      opportunity, or through the medium of an express; as, to
      express a package.

   Syn: To declare; utter; signify; testify; intimate.

Express \Ex*press"\, n. [Cf. F. expr[`e]s a messenger.]
   1. A clear image or representation; an expression; a plain
      declaration. [Obs.]

            The only remanent express of Christ's sacrifice on
            earth.                                --Jer. Taylor.

   2. A messenger sent on a special errand; a courier; hence, a
      regular and fast conveyance; commonly, a company or system
      for the prompt and safe transportation of merchandise or
      parcels; also, a railway train for transporting passengers
      or goods with speed and punctuality.

   3. An express office.

            She charged him . . . to ask at the express if
            anything came up from town.           --E. E. Hale.

   4. That which is sent by an express messenger or message.
      [Obs.] --Eikon Basilike.

   {Express office}, an office where packages for an express are
      received or delivered.

Source : WordNet®

express
     n 1: rapid transport of goods [syn: {expressage}]
     2: mail that is distributed by a rapid and efficient system
        [syn: {express mail}]
     3: public transport consisting of a fast train or bus that
        makes a limited number of scheduled stops; "he caught the
        express to New York" [ant: {local}]
     adv : by express; "please send the letter express"

express
     v 1: give expression to; "She showed her disappointment" [syn: {show},
           {evince}]
     2: articulate; either verbally or with a cry, shout, or noise;
        "She expressed her anger"; "He uttered a curse" [syn: {verbalize},
         {verbalise}, {utter}, {give tongue to}]
     3: indicate through a symbol, formula, etc.; "Can you express
        this distance in kilometers?" [syn: {state}]
     4: serve as a means for expressing something; "The painting of
        Mary carries motherly love"; "His voice carried a lot af
        anger" [syn: {carry}, {convey}]
     5: manifest the effects of (a gene or genetic trait); "Many of
        the laboratory animals express the trait"
     6: obtain from a substance, as by mechanical action; "Italians
        express coffee rather than filter it" [syn: {press out}, {extract}]
     7: send my rapid transport or special messenger service; "She
        expressed the letter to Florida"

express
     adj 1: not tacit or implied; "her express wish"
     2: without unnecessary stops; "an express train"; "an express
        shipment"

Source : Free On-Line Dictionary of Computing

Express
     
        1. A language supporting {concurrency} through {message
        passing} to named message queues from {ParaSoft} Corporation
     
        {(ftp://ftp.parasoft.com/express/docs)}.
     
        2. Data definition language, meant to become an ISO standard
        for product data representation and exchange.  TC 184/SC4 N83,
        ISO, 1991-05-31.  E-mail: .
     
        3. A data modelling language adopted by the {ISO} working
        group on {STEP}.