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OBSOLETE

OBSOLETE. That which is no longer used. Disused; neglected; not observed. The term is applied to statutes which have become inoperative by lapse of time, either because the reason for their enactment has passed away, or their subject-matter no longer exists, or they are not applicable to changed circumstances, or are tacitly disregarded by all men, yet without being expressly abrogated or repealed.  (Blacks Law 4th Edition)

ob·so·lete
[ˌäbsəˈlēt]
adjective
obsolete (adjective) (Oxford Dictionary)
  1. no longer produced or used; out of date:
    "the disposal of old and obsolete machinery" · "the phrase was obsolete after 1625"
  2. biology
    (of a part or characteristic of an organism) less developed than formerly or in a related species; rudimentary; vestigial.
 
verb
US ENGLISH
obsolete (verb) · obsoletes (third person present) · obsoleted (past tense) · obsoleted (past participle) · obsoleting (present participle)
  1. cause (a product or idea) to be or become obsolete by replacing it with something new:
    "we're trying to stimulate the business by obsoleting last year's designs"
 
Origin
late 16th century: from Latin obsoletus ‘grown old, worn out’, past participle of obsolescere ‘fall into disuse’.  
 
Absolut v.  Obsolete

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opinio juris

opinio juris (international law) | Wex | US Law | LII / Legal Information Institute

Opinio juris is a shortened form of the Latin phrase “opinio juris sive necessitatis,” which means "an opinion of law or necessity." 

Understanding Opinio Juris in Law | PDF | Legal Concepts | JudiciariesUnderstanding Opinio Juris in Law | PDF | Legal Concepts | Judiciaries

VIDEOS: 

What Does Opinio Juris Mean In International Law? - International Policy Zone

26 The interplay between contrary practice and opinio juris

Catherine Brölmann - Is the classical paradigm of state practice and opinio juris still valid today?