A vs A1, What's the Difference?

Which to use

“A” is a symbol and “A1” is a noun - they look or sound alike but fill different roles in a sentence.

#14
“A” frequency rank: #17,858
“A1” frequency rank: 17872
confusion score

Side-by-Side Comparison

Feature	A	A1
Definition	En logique, symbole de la proposition universelle affirmative.	Format d'une feuille de 594,6 mm sur 840,9.

Letter map: A vs A1

Shared letters muted; letters that set A and A1 apart highlighted. Shared run: 1.

1 ch

2 ch

Part-of-speech tell for A / A1

Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: A is asymbol and A1anoun. On the page they differ by 1 extra letter(s) - “A” sits inside “A1”. Our composite confusion score for this pair is 17872, derived from the frequency rank of both members and their visual similarity.

A is recorded at frequency rank #14, classified as asymbol. A1 is at rank #17,858, tagged as anoun, pronounced \a.œ̃\.

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 17872, this pair ranks #381,042 of 440,172 scored French confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of A vs A1

Shared letters: a. Private to "A": -. Private to "A1": -.

"A" · 1 letters · shape V · "A1" · 1 letters · shape V

Frequently Asked Questions

Can "A" and "A1" be used interchangeably?

No - they are not even the same part of speech. "A" is a symbol and "A1" a noun, so a sentence built for one is usually ungrammatical with the other.

In ordinary French text, does "A" or "A1" show up more?

"A" is the more common of the two: it sits at frequency rank #14 in our French list, against #17,858 for "A1". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

What to do next

Pair "A" vs "A1" is on the table, pick a follow-up below.

Full dictionary entry for "A" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "A1" - compare definitions side by side with the headword page. Word entry
This pair ranks #381,042 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
"A" and "A1" also get mixed up with nearby pairs, the highest-scored neighbour is "A1 vs aur". Nearby pair

Confusion rank #381,042 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.