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Ultimately from Latin accessiō, from accēdō (English accede). Cognate to French accession. First attested in 1646.


  • IPA(key): /æk.ˈsɛ.ʃən/, /əˈsɛ.ʃən/
  • (US)


accession (countable and uncountable, plural accessions)

  1. A coming to; the act of acceding and becoming joined
    a king's accession to a confederacy
  2. Increase by something added; that which is added; augmentation from without.
    • 1783, Edward Gibbon, The History of the Decline and Fall of the Roman Empire, London: W. Strahan and T. Cadell, Volume 1, Chapter 1, p. 5,[1]
      The only accession which the Roman empire received, during the first century of the Christian Aera, was the province of Britain.
    • 1803, John Browne Cutting, “A Succinct History of Jamaica” in Robert Charles Dallas, The History of the Maroons, London: Longman and Rees, Volume 1, p. xli,[2]
      [] armed vessels being provided, their crews were soon recruited by accessions from the needy or adventurous, the discontented or the bold.
  3. (law) A mode of acquiring property, by which the owner of a corporeal substance which receives an addition by growth, or by labor, has a right to the part or thing added, or the improvement (provided the thing is not changed into a different species).
  4. (law) The act by which one power becomes party to engagements already in force between other powers.
  5. The act of coming to or reaching a throne, an office, or dignity.
  6. (medicine) The invasion, approach, or commencement of a disease; a fit or paroxysm.
  7. Agreement.
  8. Access; admittance.
  9. A group of plants of the same species collected at a single location, often held in genebanks.[1]



accession (third-person singular simple present accessions, present participle accessioning, simple past and past participle accessioned)

  1. (transitive) To make a record of (additions to a collection).


Further reading[edit]





accession f (plural accessions)

  1. accession (to throne)
  2. (law) accession
    accession sociale à la propriétéassisted home-ownership scheme

Further reading[edit]