additional
/əˈdɪ.ʃə.nəl/adjective, noun
additional is spelled A-D-D-I-T-I-O-N-A-L. The wrong spelling people search most is additonal: about 200 Bing searches a month in the United States (September 2025 to August 2026), about 1 in 26 of all searches for the word. Additional is an adjective meaning “Supplemental or added to something”.
How many letters and syllables are in additional?
| Letters | 10: A-D-D-I-T-I-O-N-A-L |
|---|---|
| Syllables | 4 (from its American pronunciation) |
| In writing | 95 times per million words; the 1,125th most frequent word form |
| Wrong spellings searched | 4; the most searched, additonal, about 200 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 additional?
Additional is spelled A-D-D-I-T-I-O-N-A-L. 4 wrong spellings are searched or written often enough to measure; together they are about 1 in 11 of the searches for additional in either form.
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 additional?
Additional appears 95 times per million words in written English, the 1,125th 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 additional?
- US /əˈdɪ.ʃə.nəl/
Additional has 4 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: LL-Q1860_(eng)-Back_ache-additional.wav, En-us-additional.ogg, Wikimedia Commons (author and licence on each file's page).
What rhymes with additional?
4 words on PlainSpell end in the same sounds as additional from its last stressed vowel (/ɪʃənəl/):
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 additional
- add'l
- additionals plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does additional mean?
The meanings the English Wiktionary records, quoted as written there (source below).
adjective
- 1
Supplemental or added to something.
additional charge
noun
- 1
Something added.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How do you abbreviate additional?
Wiktionary records 2 abbreviations of additional: add'l, addnl.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Additional in Spanish, French, German and Portuguese
In the sense Supplemental or added to:
| Language | Words |
|---|---|
| French | additionnel |
| German | zusätzlich |
| Portuguese | adicional |
| Spanish | adicional, extra, de más |
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 additional come from?
Learned borrowing from Latin additionalis. By surface analysis, addition + -al.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).