AvsaoWhat's the difference?

Quick tell: A is a adjective, ao is a contraction, so they fill different roles in a sentence.

Which to use

“A” is an adjective and “ao” is a contraction - they look or sound alike but fill different roles in a sentence.

#2
“A” frequency rank
#27
“ao” frequency rank
29
confusion score

Side-by-Side Comparison

Feature A ao
Definition assinala o primeiro elemento de uma série na qual estes são distinguidos e ordenados em uma sequência alfabética contração da preposição a com o artigo definido o

Where the eye mixes A and ao

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

1 ch
A
2 ch
ao

Spelling & Dictionary Insight

These two trip readers on the page rather than in the ear: A is /a/ while ao is /aw/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 extra letter(s) - “A” sits inside “ao”, and the parts of speech differ too (adjective vs contraction), which is usually the fastest check. Our composite confusion score for this pair is 29, derived from the frequency rank of both members and their visual similarity.

A is recorded at frequency rank #2, classified as anadj, pronounced /a/. ao is at rank #27, tagged as acontraction, pronounced /aw/.

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 29, this pair ranks #75,618 of 75,631 scored Portuguese confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of A vs ao

Shared letters: a. Private to "A": -. Private to "ao": o.

"A" · 1 letters · shape V  ·  "ao" · 2 letters · shape VV

Frequently Asked Questions

Can "A" and "ao" be used interchangeably?
No - they are not even the same part of speech. "A" is an adjective and "ao" a contraction, so a sentence built for one is usually ungrammatical with the other.
Which is more common, "A" or "ao"?
"A" is the more common of the two: it sits at frequency rank #2 in our Portuguese list, against #27 for "ao". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list