[ak-sesh-uh n]
See more synonyms for accession on
  1. the act of coming into the possession of a right, title, office, etc.: accession to the throne.
  2. an increase by something added: an accession of territory.
  3. something added: a list of accessions to the college library.
  4. Law. addition to property by growth or improvement.
  5. consent; agreement; approval: accession to a demand.
  6. International Law. formal acceptance of a treaty, international convention, or other agreement between states.
  7. the act of coming near; approach.
  8. an attack or onset, as of a disease.
verb (used with object)
  1. to make a record of (a book, painting, etc.) in the order of acquisition.
  2. to acquire (a book, painting, etc.), especially for a permanent collection.

Origin of accession

1580–90; < Latin accessiōn- (stem of accessiō) an approach, addition. See access, -ion
Related formsac·ces·sion·al, adjectivenon·ac·ces·sion, nounre·ac·ces·sion, nounun·ac·ces·sion·al, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for accession

Contemporary Examples of accession

Historical Examples of accession

British Dictionary definitions for accession


  1. the act of entering upon or attaining to an office, right, condition, etc
  2. an increase due to an addition
  3. an addition, as to a collection
  4. property law
    1. an addition to land or property by natural increase or improvement
    2. the owner's right to the increased value of such land
  5. international law the formal acceptance of a convention or treaty
  6. agreement; consent
  7. a less common word for access (def. 2)
  1. (tr) to make a record of (additions to a collection)
Derived Formsaccessional, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for accession

"act of coming to a position," especially of a throne, 1640s, from Latin accessionem (nominative accessio) "a going to, joining, increase," noun of action from past participle stem of accedere (see accede).

Online Etymology Dictionary, © 2010 Douglas Harper