Accession refers to the general idea of joining or adding to. It may also refer to:

• Accession (property law)
• Accession, the act of joining a treaty by a party that did not take part in its negotiations; see Vienna Convention on the Law of Treaties#Signature, ratification and accession
  • Ratification
  • EU Accession
• Accession to the throne; not to be confused with the later ceremony of Coronation
  • Enthronement
  • Accession day, when an heir becomes monarch, and its anniversary
• Accession to elected office; inauguration
• Accession number (disambiguation)
  • Accession number (cultural property), a catalogue number assigned to an object when it becomes part of a library or museum collection
  • Accession number (bioinformatics), a unique identifier given to a biological polymer sequence (DNA, protein) when it is submitted to a sequence database
• Accession (Star Trek: Deep Space Nine)
• Accession Records, a record label created by Adrian Hates
• Instrument of Accession, a legal document introduced in 1935, used in 1947 to enable the rulers of the princely states formerly in British India to join India or Pakistan
• Instrument of Accession (Jammu and Kashmir), by which that state joined the Dominion of India (1947)
  • Accession Day (Jammu and Kashmir), a public holiday

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Look up accession in Wiktionary, the free dictionary.