The Collaborative International Dictionary of English v.0.48:

Accustom \Ac*cus"tom\, n.
   Custom. [Obs.] --Milton.
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The Collaborative International Dictionary of English v.0.48:

Accustom \Ac*cus"tom\, v. t. [imp. & p. p. Accustomed; p. pr.
   & vb. n. Accustoming.] [OF. acostumer, acustumer, F.
   accoutumer; [`a] (L. ad) + OF. costume, F. coutume, custom.
   See Custom.]
   To make familiar by use; to habituate, familiarize, or inure;
   -- with to.
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         I shall always fear that he who accustoms himself to
         fraud in little things, wants only opportunity to
         practice it in greater.                  --Adventurer.
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   Syn: To habituate; inure; exercise; train.
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The Collaborative International Dictionary of English v.0.48:

Accustom \Ac*cus"tom\, v. i.
   1. To be wont. [Obs.] --Carew.
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   2. To cohabit. [Obs.]
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            We with the best men accustom openly; you with the
            basest commit private adulteries.     --Milton.
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WordNet (r) 3.0 (2006):

accustom
    v 1: make psychologically or physically used (to something);
         "She became habituated to the background music" [syn:
         habituate, accustom]