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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.
  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.
    her accession to the throne
    • 1943 March and April, “L.N.E.R. New Mixed-Traffic 4-6-0 Locomotive”, in Railway Magazine, page 104:
      This is the 6 ft. 4-6-0 engine No. 8301, Springbok, the second design produced by Mr. Edward Thompson since his accession to office as Chief Mechanical Engineer.
    • 2022 September 9, Caroline Davies, “Charles to be proclaimed King at St James’s Palace on Saturday”, in The Guardian[2]:
      Charles will be formally proclaimed King at a historic Accession Council in an ancient ceremony at St James’s Palace on Saturday, it has been announced.
  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]
  10. (Scotland) Complicity, concurrence or assent in some action.

Derived terms[edit]



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).



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accession f (plural accessions)

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

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