<p><strong>Noun</strong></p><ul><li>A habitual practice; the usual way of acting in given circumstances.</li><li>Habits or usages collectively; convention.</li><li>A practice so long established that it has the force of law.</li><li>Such practices collectively.</li><li>Sociology: a group pattern of habitual activity usually transmitted from one generation to another.</li><li>Toll; duty.</li><li>Customs (used with a singular or plural verb): duties imposed by law on imported or, less commonly, exported goods.</li><li>(Used with a singular verb): the government department that collects these duties.</li><li>(Used with a singular verb): the section of an airport, station, etc., where baggage is checked for contraband and for goods subject to duty.</li><li>Regular patronage of a particular shop, restaurant, etc.</li><li>The customers or patrons of a business firm, collectively.</li><li>The aggregate of customers.</li><li>(In medieval Europe): a customary tax, tribute, or service owed by peasants to their lord.</li></ul><p><strong>Adjective</strong></p><ul><li>Made specially for individual customers: custom shoes.</li><li>Dealing in things so made, or doing work to order: a custom tailor.</li></ul>