noun

• (dated outside UK) Habitual buying of goods from one same vendor.
  "Thank you for your custom."
• (dated outside UK) Habitual buying of goods from one same vendor.
• (law) Long-established practice, considered as unwritten law, and resting for authority on long consent. Compare prescription.
  "The distinction between custom and usage it that usage is a fact and custom is a law. There can be usage without custom, but not custom without usage."
• (obsolete) Familiar acquaintance; familiarity.
  "Age can not wither her, nor custom stale Her infinite variety."

adj

• (especially agriculture) Done on a for-hire basis, as contrasted with being done only for oneself.
  "custom threshing"
• (archaic) Accustomed; usual.

verb

• (transitive, obsolete) To make familiar; to accustom.
  "a. 1771 (written, published posthumously) Thomas Gray, Agrippina Have not forgot your sire; the eye of Rome And the Prætorian camp have long revered, With customed awe the daughter, sister, wife, And mother of their Cæsars"
• (transitive, obsolete) To supply with customers.
  "But yet a man might reply, that if a Shooemaker ſhould haue no Shooes in his Shoppe, but onely worke, as hee is beſpoken, hee ſhould bee weakley cuſtomed."
• (transitive, obsolete) To pay the customs of.
  "Barabas, thy ships are safe, Riding in Malta Rhode; and all the merchants With other merchandize are safe arriv'd, And have sent me to know whether yourself Will come and custom them."
• (intransitive, obsolete) To have a custom.
  "For on a Bridge he cuſtometh to fight, / Which is but narrow, but exceeding long; / And in the ſame are many trap fals pight, / Through which the rider downe doth fall through ouerſight."