addendum
ad·den·dum/əˈdɛn.dəm/noun
addendum is spelled A-D-D-E-N-D-U-M: 8 letters and 3 syllables (ad·den·dum). It appears about once in every 1 million words in written English, the 33,236th most frequent word form (wordfreq, 2021 data). As a noun, addendum means “Something to be added; especially text added as an appendix or supplement to a document” (English Wiktionary, September 2026). The plural of addendum is addenda or addendums.
How many letters and syllables are in addendum?
| Letters | 8: A-D-D-E-N-D-U-M |
|---|---|
| Syllables | 3: ad·den·dum |
| In writing | about once in every 1 million words; the 33,236th most frequent word form |
| Wrong spellings searched | none measured in search |
| Rhymes with |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); rhymes and same-letter words are computed by PlainSpell from its own word list.
How common is addendum?
Addendum appears about once in every 1 million words in written English, the 33,236th 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 addendum?
- US /əˈdɛn.dəm/
- Australia /əˈden.dəm/
Addendum has 3 syllables, split ad·den·dum in writing.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Vealhurl-addendum.wav, Wikimedia Commons (author and licence on each file's page).
What rhymes with addendum?
One word on PlainSpell end in the same sounds as addendum from its last stressed vowel (/ɛndəm/):
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 addendum
- addenda plural
- addendums plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does addendum mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
Something to be added; especially text added as an appendix or supplement to a document.
An addendum was added to the contract to clarify payment terms.
- 2
A postscript.
- 3
The height by which the tooth of a gear projects beyond (outside for external, or inside for internal) the standard pitch circle or pitch line.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How do you abbreviate addendum?
Wiktionary records one abbreviation of addendum: add..
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Addendum in Spanish, French, German and Portuguese
In the sense something to be 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 addendum come from?
From the gerundive of Latin addere (“to add”).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).