The Collaborative International Dictionary of English v.0.48:

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.
      [1913 Webster]

            Their human countenance
            The express resemblance of the gods.  --Milton.
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   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.
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            I have express commandment.           --Shak.
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   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.
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            A messenger sent express from the other world.
                                                  --Atterbury.
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   2. of or pertaining to an express train or other conveyance
      designated an express[5]; makiung few or no intermediate
      stops; as, an express stop; an express fare; an express
      elevator.
      [PJC]

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

   Syn: Explicit; clear; unambiguous. See Explicit.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.
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            All the fruits out of which drink is expressed.
                                                  --Bacon.
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            And th'idle breath all utterly expressed. --Spenser.
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            Halters and racks can not express from thee
            More than by deeds.                   --B. Jonson.
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   2. To make or offer a representation of; to show by a copy or
      likeness; to represent; to resemble.
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            Each skillful artist shall express thy form. --E.
                                                  Smith.
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            So kids and whelps their sires and dams express.
                                                  --Dryden.
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   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.
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            My words express my purpose.          --Shak.
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            They expressed in their lives those excellent
            doctrines of morality.                --Addison.
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   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.
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            Mr. Phillips did express with much indignation
            against me, one evening.              --Pope.
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   5. To denote; to designate.
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            Moses and Aaron took these men, which are expressed
            by their names.                       --Num. i. 17.
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   6. To send by express messenger; to forward by special
      opportunity, or through the medium of an express; as, to
      express a package.

   7. (Genetics) to produce products that cause the appearance
      of the corresponding phenotype; -- of a gene or of an
      organism with a specific gene; as, to express the
      beta-galactosidase gene,
      [PJC]

   Syn: To declare; utter; signify; testify; intimate.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Express \Ex*press"\, n. [Cf. F. expr[`e]s a messenger.]
   1. A clear image or representation; an expression; a plain
      declaration. [Obs.]
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            The only remanent express of Christ's sacrifice on
            earth.                                --Jer. Taylor.
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   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.
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   3. An express office.
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            She charged him . . . to ask at the express if
            anything came up from town.           --E. E. Hale.
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   4. That which is sent by an express messenger or message.
      [Obs.] --Eikon Basilike.
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   5. a railway train or bus for transporting passengers or
      goods with speed and punctuality; a train or bus that does
      not stop at certain stations. Contrasted to local; as,
      take the express to get there faster.

   Syn: express train. [PJC]

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

   Express train, a railway train (such as a subway train)
      that does not stop at certain stations, but only at
      stations designated express stops.
      [1913 Webster]

WordNet (r) 3.0 (2006):

express
    adv 1: by express; "please send the letter express"
    adj 1: not tacit or implied; "her express wish"
    2: without unnecessary stops; "an express train"; "an express
       shipment"
    n 1: mail that is distributed by a rapid and efficient system
         [syn: express, express mail]
    2: public transport consisting of a fast train or bus that makes
       only a few scheduled stops; "he caught the express to New
       York" [syn: express, limited] [ant: local]
    3: rapid transport of goods [syn: express, expressage]
    v 1: give expression to; "She showed her disappointment" [syn:
         express, show, evince]
    2: articulate; either verbally or with a cry, shout, or noise;
       "She expressed her anger"; "He uttered a curse" [syn:
       express, verbalize, verbalise, utter, give tongue
       to]
    3: serve as a means for expressing something; "The painting of
       Mary carries motherly love"; "His voice carried a lot of
       anger" [syn: carry, convey, express]
    4: indicate through a symbol, formula, etc.; "Can you express
       this distance in kilometers?" [syn: express, state]
    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,
       express, extract]
    7: send by rapid transport or special messenger service; "She
       expressed the letter to Florida"

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

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.