The Collaborative International Dictionary of English v.0.48:

Include \In*clude"\, v. t. [imp. & p. p. Included; p. pr. &
   vb. n. Including.] [L. includere, inclusum; pref. in- in +
   claudere to shut. See Close, and cf. Enclose.]
   [1913 Webster]
   1. To confine within; to hold; to contain; to shut up; to
      inclose; as, the shell of a nut includes the kernel; a
      pearl is included in a shell.
      [1913 Webster]

   2. To comprehend or comprise, as a genus the species, the
      whole a part, an argument or reason the inference; to
      contain; to embrace; as, this volume of Shakespeare
      includes his sonnets; he was included in the invitation to
      the family; to and including page twenty-five.
      [1913 Webster]

            The whole included race, his purposed prey.
                                                  --Milton.
      [1913 Webster]

            The loss of such a lord includes all harm. --Shak.
      [1913 Webster]

   3. To conclude; to end; to terminate. [Obs.]
      [1913 Webster]

            Come, let us go; we will include all jars
            With triumphs, mirth, and rare solemnity. --Shak.

   Syn: To contain; inclose; comprise; comprehend; embrace;
        involve.
        [1913 Webster]

WordNet (r) 3.0 (2006):

include
    v 1: have as a part, be made up out of; "The list includes the
         names of many famous writers" [ant: exclude]
    2: consider as part of something; "I include you in the list of
       culprits" [ant: except, exclude, leave off, leave
       out, omit, take out]
    3: add as part of something else; put in as part of a set,
       group, or category; "We must include this chemical element in
       the group"
    4: allow participation in or the right to be part of; permit to
       exercise the rights, functions, and responsibilities of;
       "admit someone to the profession"; "She was admitted to the
       New Jersey Bar" [syn: admit, let in, include] [ant:
       exclude, keep out, shut, shut out]

Moby Thesaurus II by Grady Ward, 1.0:

163 Moby Thesaurus words for "include":
   accouple, accumulate, add, admit, agglutinate, allow for,
   amalgamate, amass, articulate, assemble, assimilate, associate,
   band, beleaguer, beset, besiege, blend, blockade, bond, bound,
   box in, bracket, bridge, bridge over, cage, catalogue, categorize,
   cement, chain, chamber, clap together, classify, close in,
   coalesce, collect, combine, come together, compass, complete,
   compound, comprehend, comprise, concatenate, conglobulate, conjoin,
   conjugate, connect, consolidate, contain, coop, coop in, coop up,
   copulate, cordon, cordon off, corral, count, count in, couple,
   cover, embed, embody, embrace, encircle, enclose, encompass,
   enfold, enshrine, envisage, fence in, file, fill, fill in,
   fill out, flux, fuse, gather, glue, group, hedge in, hem in, hold,
   house in, impound, imprison, incarcerate, incorporate, integrate,
   interblend, interfuse, internalize, involve, jail, join,
   keep within, kennel, knot, lay together, league, leaguer, link,
   list, lump together, make one, marry, marshal, mass, meld,
   melt into one, merge, mew, mew up, mix, mobilize, number,
   number among, occupy, pair, pen, pen in, piece together, pocket,
   put in, put together, quarantine, rail in, receive, reckon among,
   reckon in, reckon with, reembody, register, roll into one,
   shade into, shrine, shut in, shut up, solder, solidify, span,
   splice, stable, stick together, subsume, surround, syncretize,
   syndicate, synthesize, tabulate, take in, take into account,
   take into consideration, take up, tape, tie, unify, unite, wall in,
   weld, wrap, yard, yard up, yoke



The Jargon File (version 4.4.7, 29 Dec 2003):

include
 vt.

    [Usenet]

    1. To duplicate a portion (or whole) of another's message (typically with
    attribution to the source) in a reply or followup, for clarifying the
    context of one's response. See the discussion of inclusion styles under
    Hacker Writing Style.

    2. [from C] #include  has appeared in sig blocks to refer
    to a notional standard disclaimer file.


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

include

   [Usenet] 1. To duplicate a portion (or whole) of another's
   message (typically with attribution to the source) in a reply
   or followup, for clarifying the context of one's response.
   See the discussion of inclusion styles under "Hacker Writing
   Style".

   2. [C] "#include " has appeared in sig
   blocks to refer to a notional "standard disclaimer file".

   [Jargon File]