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PlainSpell

accession

/ækˈsɛʃ.ən/noun, verb

accession is spelled A-C-C-E-S-S-I-O-N. The wrong spelling people search most is assession: about 90 Bing searches a month in the United States (September 2025 to August 2026), about 1 in 13 of all searches for the word. Accession is a noun meaning “A coming to; the act of acceding and becoming joined”. The plural of accession is accessions.

How many letters and syllables are in accession?

Letters9: A-C-C-E-S-S-I-O-N
Syllables3 (from its American pronunciation)
In writing2.5 times per million words; the 17,122nd most frequent word form
Wrong spellings searched1; the most searched, assession, about 90 Bing searches a month (all of them)
Rhymes with

Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026); rhymes and same-letter words are computed by PlainSpell from its own word list.

How do you spell accession?

Accession is spelled A-C-C-E-S-S-I-O-N. One wrong spelling is searched or written often enough to measure; together they are about 1 in 13 of the searches for accession in either form.

accessionthe right spelling1,100 searches a month
assessions in place of c, s in place of c90 searches a month

Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026). Wrong spellings are taken from Wiktionary entries tagged "misspelling" and its obsolete or nonstandard forms, Wikipedia's Lists of common misspellings and the codespell dictionary, then measured. The proofreader's marks show the change that corrects each one.

How common is accession?

Accession appears 2.5 times per million words in written English, the 17,122nd most frequent word form in the list.

Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).

How do you pronounce accession?

  • US /ækˈsɛʃ.ən/
  • US /əˈsɛʃ.ən/
  • Australia /ækˈseʃ.ən/

Accession has 3 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: En-us-accession.ogg, Wikimedia Commons (author and licence on each file's page).

What rhymes with accession?

The 12 most written words on PlainSpell end in the same sounds as accession from its last stressed vowel (/ɛʃən/):

Computed by PlainSpell from the pronunciations in the English Wiktionary (dump of September 2, 2026): a rhyme shares every sound from the last stressed vowel to the end; ordered by written frequency (wordfreq 3.1).

Forms of accession

  • accessions plural, present, singular, he/she/it
  • accessioning participle, present
  • accessioned participle, past

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).

What does accession mean?

The meanings the English Wiktionary records, quoted as written there (source below).

noun

  1. 1

    A coming to; the act of acceding and becoming joined.

    a king's accession to a confederacy

  2. 2

    Increase by something added; that which is added; augmentation from without.

  3. 3

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

  4. 4

    A 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).

  5. 5

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

    accession to the European Union

  6. 6

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

    her accession to the throne

  7. 7

    The invasion, approach, or commencement of a disease; a fit or paroxysm.

  8. 8

    Agreement.

verb

  1. 1

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

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).

Accession in Spanish, French, German and Portuguese

LanguageWords
Frenchaccession (a coming to)
GermanBeitritt (a coming to), Zuwachs (increase by something added), Verbindung ((legal) mode of acquiring property), Antritt, Besteigung, Thronbesteigung (act of coming to or reaching a throne, an…)
Spanishascenso (a coming to), accesión ((legal) mode of acquiring property)
Portugueseacessão (increase by something added)

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.

Where does accession come from?

Ultimately from Latin accessiō(n), from accēdō (English accede). Cognate to French accession. First attested in 1646.

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).

What to look up after accession