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Definition of accession

accession

/əkˈsɛʃ.ən/
ac · ces · sion

Plural:accessions
•
Adjective:accessional
•
Past Simple:accessioned
•
Past Participle:accessioned
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Present Participle:accessioning
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accession Lexical Profile

accession Game Scores & Validity

• noun

1

The attainment or assumption of a position of high rank, power, or dignity, such as the throne or a presidency.

Example

"The nation celebrated the monarch's accession to the throne with a week of public festivities."


2

The formal act by which a state or organization accepts and becomes a party to an international treaty, union, or agreement already signed by other states.

Example

"Negotiations regarding the country's accession to the European Union lasted for nearly a decade."


3

A new item added to an existing collection of books, paintings, or artifacts in a library or museum, or the act of making such an addition.

Example

"The rare medieval manuscript was the museum's most prized accession of the year."

Synonyms
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Antonyms
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• verb

1

To formally record the addition of a new item to a library, museum, or archival collection.

Example

"The archivist spent the afternoon accessioning the donated photographs into the digital catalog."

Synonyms
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Word Nuance & Usage

Often confused with 'ascension', which refers to the act of rising or moving upward, whereas 'accession' denotes the formal attainment of a high office, rank, or treaty membership.

• Rhymes for accession

Word Origin & Etymology

Borrowed in the late 16th century from Middle French or directly from Latin accessio ('a coming to, an approach, an addition'), a noun of action from accedere ('to approach or yield to').

Cite this Entry


Wordmom. (2026). Definition of Accession. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/accession
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