Which to use
“A1” and “ab” are a confusable French pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #17,858
- “A1” frequency rank
- #9,951
- “ab” frequency rank
- 27809
- confusion score
Side-by-Side Comparison
| Feature | A1 | ab |
|---|---|---|
| Definition | Format d'une feuille de 594,6 mm sur 840,9. | ou (académique) Onzième mois du calendrier hébreu. |
Where the eye mixes A1 and ab
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.
Why the eye confuses A1 with ab
A purely visual mix-up. A1 (\a.œ̃\) and ab (\av\) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by a single letter - 1 in “A1” becomes b in “ab”. Our composite confusion score for this pair is 27809, 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\. ab is at rank #9,951, tagged as anoun, pronounced \av\.
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 27809, this pair ranks #326,627 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of A1 vs ab
Shared letters: a. Private to "A1": -. Private to "ab": b.
"A1" · 1 letters · shape V · "ab" · 2 letters · shape VC
Frequently Asked Questions
Is swapping "A1" for "ab" ever safe?
Which is more common, "A1" or "ab"?
Useful next steps
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "A1" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "ab" - compare definitions side by side with the headword page. Word entry
- This pair ranks #326,627 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "A1" and "ab" also get mixed up with nearby pairs, the highest-scored neighbour is "A1 vs aur". Nearby pair
Confusion rank #326,627 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.