The Collaborative International Dictionary of English v.0.48:

Enter \En"ter\, v. t. [imp. & p. p. Entered; p. pr. & vb. n.
   Entering.] [OE. entren, enteren, F. entrer, fr. L. intrare,
   fr. intro inward, contr. fr. intero (sc. loco), fr. inter in
   between, between. See Inter-, In, and cf. Interior.]
   1. To come or go into; to pass into the interior of; to pass
      within the outer cover or shell of; to penetrate; to
      pierce; as, to enter a house, a closet, a country, a door,
      etc.; the river enters the sea.
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            That darksome cave they enter.        --Spenser.
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            I, . . . with the multitude of my redeemed,
            Shall enter heaven, long absent.      --Milton.
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   2. To unite in; to join; to be admitted to; to become a
      member of; as, to enter an association, a college, an
      army.
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   3. To engage in; to become occupied with; as, to enter the
      legal profession, the book trade, etc.
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   4. To pass within the limits of; to attain; to begin; to
      commence upon; as, to enter one's teens, a new era, a new
      dispensation.
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   5. To cause to go (into), or to be received (into); to put
      in; to insert; to cause to be admitted; as, to enter a
      knife into a piece of wood, a wedge into a log; to enter a
      boy at college, a horse for a race, etc.
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   6. To inscribe; to enroll; to record; as, to enter a name, or
      a date, in a book, or a book in a catalogue; to enter the
      particulars of a sale in an account, a manifest of a ship
      or of merchandise at the customhouse.
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   7. (Law)
      (a) To go into or upon, as lands, and take actual
          possession of them.
      (b) To place in regular form before the court, usually in
          writing; to put upon record in proper from and order;
          as, to enter a writ, appearance, rule, or judgment.
          --Burrill.
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   8. To make report of (a vessel or her cargo) at the
      customhouse; to submit a statement of (imported goods),
      with the original invoices, to the proper officer of the
      customs for estimating the duties. See Entry, 4.
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   9. To file or inscribe upon the records of the land office
      the required particulars concerning (a quantity of public
      land) in order to entitle a person to a right pf
      pre["e]mption. [U.S.] --Abbott.
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   10. To deposit for copyright the title or description of (a
       book, picture, map, etc.); as, "entered according to act
       of Congress."
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   11. To initiate; to introduce favorably. [Obs.] --Shak.
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The Collaborative International Dictionary of English v.0.48:

entering \entering\ adj.
   incoming; -- of a person or group assuming a role. Opposite
   of leaving and outgoing. [predicate]

   Syn: ingoing.
        [WordNet 1.5] Entering edge

WordNet (r) 3.0 (2006):

entering
    n 1: a movement into or inward [syn: entrance, entering]
    2: the act of entering; "she made a grand entrance" [syn:
       entrance, entering, entry, ingress, incoming]

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "entering":
   approaching, arriving, booking, cataloging, chronicling, coming,
   enlistment, enrollment, entry, homeward, homeward-bound,
   impanelment, in, inbound, incoming, indexing, inflooding,
   inflowing, ingoing, ingressive, inpouring, inscribing, inscription,
   insertion, intrusive, invasive, inventorying, inward, inward-bound,
   irruptive, listing, logging, matriculation, posting,
   record keeping, recordation, recording, register, registration,
   registry, tabulation