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1. Commonly practiced, used, or encountered; usual. See Synonyms at usual.
2. Based on custom or tradition rather than written law or contract.

cus′tom·ar′i·ly (-mâr′ə-lē) adv.
cus′tom·ar′i·ness n.
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The quality or condition of being usual:
References in periodicals archive ?
But things went beyond customariness as clashes broke out between police and locals after a police opened fire to disperse the protesters.
(17) Thus, within the Anglo-African context, non-state rules that do not conform to this criterion of customariness, for instance 'modern innovations', do not fall under the concept of customary law.
Consequently, in their discussion of this rule, the authors relied on IHL to establish the customariness of the rule in IAC, and IHRL to establish its customariness in NIAC.