Definition of accession in English:

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Pronunciation: /əkˈsɛʃ(ə)n/


1 [mass noun] The attainment or acquisition of a position of rank or power: the Queen’s accession to the throne
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  • But Preston has been named as one of the nation's ‘Golden Cities’ to mark the 50th anniversary of the Queen's accession to the throne.
  • The Queen yesterday marked the 50th anniversary of her father's death - and of her accession to the throne - with a poignant visit to a cancer unit.
  • Albert's accession to the throne is a two-step event, with another ceremony expected to draw heads of state on November 19.
succession, elevation;
assumption of, attainment of, inheritance of
1.1The action or process of formally joining or being accepted by an institution or group: the accession of Spain and Portugal to the EU
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  • The working party on China's accession will formally approve the package on Monday at WTO headquarters in Geneva, clearing the way for entry by the end of this year.
  • This week, Bulgaria's intellectual potential will be called upon to aid the country in the process of its accession into the European Union.
  • Thirdly, this process of accession has established very close links between the civil society here and the civil societies of the member states.
1.2The formal acceptance of a treaty or agreement: accession to the Treaty of Rome was effected in 1971
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  • It is in this context that the Russian side raises the question of linking NATO membership for certain states to their accession to the Agreement on Adaptation of the CFE Treaty.
  • Goff said accession to the treaty ‘signals that New Zealand is committed to closer engagement with ASEAN, and with Asia more generally.’
  • It said the two sides agreed to hold the signing ceremony for China's accession to the treaty at a meeting between Chinese and ASEAN leaders slated for October on the Indonesian resort island of Bali.
assent, consent, agreement;
acceptance of, acquiescence in, endorsement of, compliance with, concurrence with, recognition of
2A new item added to an existing collection of books, paintings, or artefacts: the day-to-day work of cataloguing new accessions [as modifier]: the accession number
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  • Twelve of these accessions were taken from collections of J. Bergelson and R. Mauricio.
  • All the accessions were collected from various regions of the Middle East.
  • To mark the occasion the museum's curators organized an exhibition featuring objects from the permanent collection, almost all of which were recent accessions specifically donated to celebrate the new building.
addition, acquisition, new item, gift, purchase, adjunct, add-on, gain
2.1An amount added to an existing quantity of something: substantial accessions of gold
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  • The eastern frontier of the new Poland was fixed to run along the Curzon Line, while the question of the western border was left open, with a reference to ‘substantial accessions of territory in the north and west’.
  • After clearing of native vegetation, rainfall accessions to the groundwater has increased in the order of 10-fold over natural rates.


[with object]
Record the addition of (a new item) to a library, museum, or other collection: each book must be accessioned and the data entered into the computer
More example sentences
  • In March 1934, the trustees met the financial terms of the Bliss will, her bequest was accessioned and a Museum of Modern Art with a permanent collection became a reality.
  • That the Metropolitan Museum accessioned no works by Sargent between 1941 and 1949 reflected the distractions of World War II and the fact that interest in late nineteenth-century cosmopolites like Sargent was at its nadir.
  • The collections were accessioned by the NMB, and distributed to specialists for identification and preparation of systematic monographs.


Late 16th century (in the general sense 'something added'): from Latin accessio(n-), from the verb accedere 'approach, come to' (see accede).

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Line breaks: ac¦ces|sion

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