The Collaborative International Dictionary of English v.0.48:

Custom \Cus"tom\, v. t. [Cf. OF. costumer. Cf. Accustom.]
   [1913 Webster]
   1. To make familiar; to accustom. [Obs.] --Gray.
      [1913 Webster]

   2. To supply with customers. [Obs.] --Bacon.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Custom \Cus"tom\, v. i.
   To have a custom. [Obs.]
   [1913 Webster]

         On a bridge he custometh to fight.       --Spenser.
   [1913 Webster]

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.
      [1913 Webster]

            Render, therefore, to all their dues: tribute to
            whom tribute is due; custom to whom custom. --Rom.
                                                  xiii. 7.
      [1913 Webster]

   2. pl. Duties or tolls imposed by law on commodities,
      imported or exported.
      [1913 Webster]

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.]
   [1913 Webster]
   1. Frequent repetition of the same act; way of acting common
      to many; ordinary manner; habitual practice; usage; method
      of doing or living.
      [1913 Webster]

            And teach customs which are not lawful. --Acts xvi.
                                                  21.
      [1913 Webster]

            Moved beyond his custom, Gama said.   --Tennyson.
      [1913 Webster]

            A custom
            More honored in the breach than the observance.
                                                  --Shak.
      [1913 Webster]

   2. Habitual buying of goods; practice of frequenting, as a
      shop, manufactory, etc., for making purchases or giving
      orders; business support.
      [1913 Webster]

            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.
      [1913 Webster]

   Note: Usage is a fact. Custom is a law. There can be no
         custom without usage, though there may be usage without
         custom. --Wharton.
         [1913 Webster]

   4. Familiar aquaintance; familiarity. [Obs.]
      [1913 Webster]

            Age can not wither her, nor custom stale
            Her infinite variety.                 --Shak.
      [1913 Webster]

   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.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Custom \Cus"tom\, v. t.
   To pay the customs of. [Obs.] --Marlowe.
   [1913 Webster]

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"

Moby Thesaurus II by Grady Ward, 1.0:

212 Moby Thesaurus words for "custom":
   Mishnah, Spiritus Mundi, Sunna, Talmud, action, actions, activity,
   acts, address, affectation, air, ancient wisdom, archetypal myth,
   archetypal pattern, assembled, automatism, bad habit, bearing,
   behavior, behavior pattern, behavioral norm, behavioral science,
   bienseance, bon ton, built, business, canon, carriage,
   carriage trade, cast, characteristic, civility, clientage,
   clientele, common law, comportment, conduct, conformity,
   constructed, consuetude, convenance, convention,
   conventional usage, conventionalism, conventionality, correctness,
   crafted, created, creature of habit, culture pattern, custom-built,
   custom-made, customs, decency, decorousness, decorum, demeanor,
   deportment, doing, doings, dues, duty, especially, etiquette,
   excise, exclusively, expressly, extracted, fabricated, fashion,
   fashioned, fixture, folk motif, folklore, folktale, folkway,
   force of habit, forged, form, formality, formed, gathered,
   gestures, goings-on, good form, good name, goodwill, grown, guise,
   habit, habit pattern, habitude, handcrafted, handmade, harvested,
   haute couture, high fashion, homemade, homespun, immemorial usage,
   impost, institution, law, legend, levy, lore, machine-made,
   machined, made, made to order, maintien, man-made, manner, manners,
   manufactured, market, matter of course, method, methodology,
   methods, mien, milled, mined, mode, modus vivendi, mold, molded,
   motions, movements, moves, myth, mythology, observable behavior,
   particularly, patronage, pattern, peculiarity, poise, port, pose,
   posture, practice, praxis, precedent, precept, prefab,
   prefabricated, prescription, presence, prevailing taste, procedure,
   proceeding, processed, proper thing, propriety, public,
   purchasing public, put together, racial memory, raised,
   ready-for-wear, ready-formed, ready-made, ready-prepared,
   ready-to-wear, refined, repute, ritual, routine, rubric, rule,
   rural market, second nature, seemliness, shaped, smelted,
   social convention, social science, social usage, specially,
   stereotype, stereotyped behavior, stream of fashion, style,
   suburban market, support, swim, tactics, tailor-made, tariff, tax,
   to order, toll, tone, trade, tradition, traditionalism,
   traditionality, traffic, trend, trick, usage, use, vogue, way,
   way of life, ways, well-built, well-constructed, well-made, wont,
   youth market



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

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)


Easton's 1897 Bible Dictionary:

Custom
   a tax imposed by the Romans. The tax-gatherers were termed
   publicans (q.v.), who had their stations at the gates of cities,
   and in the public highways, and at the place set apart for that
   purpose, called the "receipt of custom" (Matt.9: 9; Mark 2:14),
   where they collected the money that was to be paid on certain
   goods (Matt.17:25). These publicans were tempted to exact more
   from the people than was lawful, and were, in consequence of
   their extortions, objects of great hatred. The Pharisees would
   have no intercourse with them (Matt.5:46, 47; 9:10, 11).

     A tax or tribute (q.v.) of half a shekel was annually paid by
   every adult Jew for the temple. It had to be paid in Jewish coin
   (Matt. 22:17-19; Mark 12:14, 15). Money-changers (q.v.) were
   necessary, to enable the Jews who came up to Jerusalem at the
   feasts to exchange their foreign coin for Jewish money; but as
   it was forbidden by the law to carry on such a traffic for
   emolument (Deut. 23:19, 20), our Lord drove them from the temple
   (Matt. 21:12: Mark 11:15).


Bouvier's Law Dictionary, Revised 6th Ed (1856):

CUSTOM. A usage which had acquired the force of law. It is, in fact, a lex
loci, which regulates all local or real property within its limits. A
repugnancy which destroys it, must be such as to show it never did exist. 5
T. R. 414. In Pennsylvania no customs have the force of law but those which
prevail throughout the state. 6 Binn. 419, 20.
     2. A custom derives its force from the tacit consent of the legislature
and the people, and supposes an original, actual deed or agreement. 2 Bl.
Com. 30, 31; 1 Chit. Pr. 283. Therefore, custom is the best interpreter of
laws: optima est legum interpres consuetudo. Dig. 1, 8, 37; 2 Inst. 18. It
follows, therefore, there; can be no custom in relation to a matter
regulated by law. 8 M. R. 309. Law cannot be established or abrogated except
by the sovereign will, but this will may be express or implied and presumed
and whether it manifests itself by word or by a series of facts, is of
little importance. When a custom is public, peaceable, uniform, general,
continued, reasonable and certain, and has lasted "time whereof the memory
of man runneth not to the contrary," it acquires the force of law. And when
any doubts arise as to the meaning of a statute, the custom which has
prevailed on the subject ought to have weight in its construction, for the
manner in which a law has always been executed is one of its modes of
interpretation. 4 Penn. St. Rep. 13.
     3. Customs are general or, particular customs. 1. By general customs is
meant the common law itself, by which proceedings and determinations in
courts are guided.
     2. Particular customs, are those which affect the inhabitants of some
particular districts only. 1 Bl. Com. 68, 74. Vide 1 Bouv. Inst. n. 121 Bac.
Ab. h.t.; 1 Bl. Com. 76; 2 Bl. Com. 31; 1 Lill. Reg. 516; 7 Vin. Ab. 164;
Com. Dig. h.t.; Nelson's Ab. h.t. the various Amer. Digs. h.t. Ayl. Pand.
15, 16; Ayl. Pareg. 194; Doct. Pl. 201; 3 W. C. C. R. 150; 1 Gilp. 486; Pet.
C. C. R. 220; I Edw. Ch. R. 146; 1 Gall. R. 443; 3 Watts, R. 178; 1 Rep.
Const. Ct. 303, 308; 1 Caines, R. 45; 15 Mass. R. 433; 1 Hill, R. 270;
Wright, R. 573; 1 N. & M. 176; 5 Binn. R. 287; 5 Ham. R. 436; 3 Conn. R. 9;
2 Pet. R. 148; 6 Pet. R. 715; 6 Porter R. 123; 2 N. H. Rep. 93; 1 Hall, R.
612; 1 Harr. & Gill, 239; 1 N. S. 192; 4 L. R. 160; 7 L. R. 529; Id. 215.



Bouvier's Law Dictionary, Revised 6th Ed (1856):

CUSTOMS. This term is usually applied to those taxes which are payable upon
goods and merchandise imported or exported. Story, Const. Sec. 949; Bac. Ab.
Smuggling.