ad infinitum
/æd ˌɪn.fəˈnaɪ.təm/
"ad-infinitum" is a 11-letter English headword indexed on PlainSpell.
The verdict
“ad infinitum” is uncommon English (outside the top frequency list), classed as an adverb. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 12
- letters
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Endlessly; for ever; never-endingly.
Corpus desk
Index EN-ad-infinitum · ad infinitum · English
ad infinitum · unranked · 0 variants · 0 confusables
- FREQ-UNRANKED Unranked
- LEN-MEGA 12 letters
- VOW-5 5 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-THIN "A" thin
- PHOTO-UNK Peer pending
Read with this headword: Spelling guide for this pattern
Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.
| Property | Value |
|---|---|
| Headword | ad infinitum |
| Language | English |
| Part of speech | Adverb |
| IPA | /æd ˌɪn.fəˈnaɪ.təm/ |
| Letters | 12 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “ad infinitum” in English
Rare enough to double-check
ad infinitum is uncommon English outside the top frequency list, classed as anadverb, transcribed /æd ˌɪn.fəˈnaɪ.təm/. Rarity is why readers land here mid-draft. Gloss: "Endlessly; for ever; never-endingly.".
ad infinitum doesn't appear in our generated misspelling index, which points to an orthography that plays by predictable English rules. This entry stands alone in our confusable dataset, a sign it's visually distinctive enough not to be mixed up with another word.
Etymologically, the entry records: Unadapted borrowing from Latin ad īnfīnītum (“to infinity”). The correct English form is ad infinitum, spelled A-D- -I-N-F-I-N-I-T-U-M.
Definition
- 1Endlessly; for ever; never-endingly.
Recorded use
Wiktionary exampleThese source excerpts show how ad infinitum appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
The idea of eternal return is a mysterious one, and Nietzsche has often perplexed other philosophers with it: to think that everything recurs as we once experienced it, and that the recurrence itself recurs ad infinitum!
Etymology
Unadapted borrowing from Latin ad īnfīnītum (“to infinity”).
This word in other languages
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.