accession

plural accessions

1. countableuncountableA coming to; the act of acceding and becoming joined.

   a king's accession to a confederacy

2. countableuncountableIncrease by something added; that which is added; augmentation from without.

   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, […] armed vessels being provided, their crews were soon recruited by accessions from the needy or adventurous, the discontented or the bold.

   1 more example

   The only accession which the Roman empire received, during the first century of the Christian Aera, was the province of Britain.

   1776–1788, Edward Gibbon, chapter 1, in The History of the Decline and Fall of the Roman Empire, volume (please specify |volume=I to VI), London: […] W[illiam] Strahan; and T[homas] Cadell, […], →OCLC, page 5

   1. countableuncountableSuch augmentation that adds to the collections of a museum or archive; a thing thus added.

      Antonyms: deaccession, deacquisition

3. countableuncountablelawA 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. countableuncountablelawThe act by which one power becomes party to engagements already in force between other powers.

   accession to the European Union

5. countableuncountableThe act of coming to or reaching a throne, an office, or dignity.

   her accession to the throne

   2 more examples

   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.

   1943 March and April, “L.N.E.R. New Mixed-Traffic 4-6-0 Locomotive”, in Railway Magazine, page 104

   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.

   2022 September 9, Caroline Davies, “Charles to be proclaimed King at St James’s Palace on Saturday”, in The Guardian

6. countableuncountablemedicineThe invasion, approach, or commencement of a disease; a fit or paroxysm.
7. countableuncountableAgreement.
8. countableuncountableAccess; admittance.
9. countableuncountableA group of plants of the same species collected at a single location, often held in genebanks.
10. ScotlandcountableuncountableComplicity, concurrence or assent in some action.

present singular third person accessions · participle present accessioning · participle past accessioned · past accessioned

1. transitiveTo make a record of (additions to a collection); to add (something) to a collection (usually a museum's or archive's collection).

   Antonyms: deaccession