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From 中期英語 legittimacion, from Middle French legitimacion and its etymon, Medieval Latin lēgitimātiō, lēgitimātiōnem, from lēgitimāre (“to legitimate”), from Latin lēgitimus.

legitimation (usually uncountable, plural legitimations)

The process of making or declaring a person legitimate.
(obsolete) Legitimacy.
- c. 1596 (date written), William Shakespeare, “The Life and Death of King Iohn”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act I, scene i]:
  
  I am not Sir Roberts sonne, / I haue disclaim 'd Sir Robert and my land, / Legitimation, name, and all is gone […] .
The act of establishing something as lawful; authorization.
- 2002, Colin Jones, The Great Nation, Penguin, published 2003, page 231:
  
  Le Paige established a legitimation for the Parlement 's authority which was part history, part romantic fiction, and part political wishful thinking.

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