Which to use
“A1” is a noun and “af” is a preposition - they look or sound alike but fill different roles in a sentence.
- #17,858
- “A1” frequency rank
- #14,405
- “af” frequency rank
- 32263
- confusion score
Side-by-Side Comparison
| Feature | A1 | af |
|---|---|---|
| Definition | Format d'une feuille de 594,6 mm sur 840,9. | De. Note d’usage : la préposition est suivie du datif. |
Where the eye mixes A1 and af
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.
Why the eye confuses A1 with af
These two trip readers on the page rather than in the ear: A1 is \a.œ̃\ while af is \aːv\. Spoken aloud the problem disappears. In writing it persists, because they differ by a single letter - 1 in “A1” becomes f in “af”, and the parts of speech differ too (noun vs preposition), which is usually the fastest check. Our composite confusion score for this pair is 32263, derived from the frequency rank of both members and their visual similarity.
A1 is recorded at frequency rank #17,858, classified as anoun, pronounced \a.œ̃\. af is at rank #14,405, tagged as aprep, pronounced \aːv\.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 32263, this pair ranks #298,404 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of A1 vs af
Shared letters: a. Private to "A1": -. Private to "af": f.
"A1" · 1 letters · shape V · "af" · 2 letters · shape VC
Frequently Asked Questions
Do "A1" and "af" mean the same thing in a sentence?
In ordinary French text, does "A1" or "af" show up more?
After this comparison
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "A1" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "af" - compare definitions side by side with the headword page. Word entry
- This pair ranks #298,404 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "A1" and "af" also get mixed up with nearby pairs, the highest-scored neighbour is "A1 vs aur". Nearby pair
Confusion rank #298,404 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.