The Collaborative International Dictionary of English v.0.48:

Custom \Cus"tom\, v. t. [Cf. OF. costumer. Cf. Accustom.]
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   1. To make familiar; to accustom. [Obs.] --Gray.
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   2. To supply with customers. [Obs.] --Bacon.
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The Collaborative International Dictionary of English v.0.48:

Custom \Cus"tom\, v. i.
   To have a custom. [Obs.]
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         On a bridge he custometh to fight.       --Spenser.
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The Collaborative International Dictionary of English v.0.48:

Custom \Cus"tom\, n. [OF. coustume, F. coutume, tax, i. e., the
   usual tax. See 1st Custom.]
   1. The customary toll, tax, or tribute.
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            Render, therefore, to all their dues: tribute to
            whom tribute is due; custom to whom custom. --Rom.
                                                  xiii. 7.
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   2. pl. Duties or tolls imposed by law on commodities,
      imported or exported.
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The Collaborative International Dictionary of English v.0.48:

Custom \Cus"tom\ (k[u^]s"t[u^]m), n. [OF. custume, costume,
   Anglo-Norman coustome, F. coutume, fr. (assumed) LL.
   consuetumen custom, habit, fr. L. consuetudo, -dinis, fr.
   consuescere to accustom, verb inchoative fr. consuere to be
   accustomed; con- + suere to be accustomed, prob. originally,
   to make one's own, fr. the root of suus one's own; akin to E.
   so, adv. Cf. Consuetude, Costume.]
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   1. Frequent repetition of the same act; way of acting common
      to many; ordinary manner; habitual practice; usage; method
      of doing or living.
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            And teach customs which are not lawful. --Acts xvi.
                                                  21.
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            Moved beyond his custom, Gama said.   --Tennyson.
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            A custom
            More honored in the breach than the observance.
                                                  --Shak.
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   2. Habitual buying of goods; practice of frequenting, as a
      shop, manufactory, etc., for making purchases or giving
      orders; business support.
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            Let him have your custom, but not your votes.
                                                  --Addison.
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   3. (Law) Long-established practice, considered as unwritten
      law, and resting for authority on long consent; usage. See
      Usage, and Prescription.
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   Note: Usage is a fact. Custom is a law. There can be no
         custom without usage, though there may be usage without
         custom. --Wharton.
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   4. Familiar aquaintance; familiarity. [Obs.]
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            Age can not wither her, nor custom stale
            Her infinite variety.                 --Shak.
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   Custom of merchants, a system or code of customs by which
      affairs of commerce are regulated.

   General customs, those which extend over a state or
      kingdom.

   Particular customs, those which are limited to a city or
      district; as, the customs of London.

   Syn: Practice; fashion. See Habit, and Usage.
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The Collaborative International Dictionary of English v.0.48:

Custom \Cus"tom\, v. t.
   To pay the customs of. [Obs.] --Marlowe.
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WordNet (r) 3.0 (2006):

custom
    adj 1: made according to the specifications of an individual
           [syn: custom-made, custom] [ant: ready-made]
    n 1: accepted or habitual practice [syn: custom, usage,
         usance]
    2: a specific practice of long standing [syn: custom,
       tradition]
    3: money collected under a tariff [syn: customs, customs
       duty, custom, impost]
    4: habitual patronage; "I have given this tailor my custom for
       many years"

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

custom
bespoke

   (Or "bespoke") An adjective describing any product that is
   special in some way, individually created for a specific user
   or system, as opposed to generic or off-the-shelf.

   (2008-06-25)