Which to use
“AUC” is an adverb and “aux” is an adjective - they look or sound alike but fill different roles in a sentence.
- #48,600
- “AUC” frequency rank
- #16,176
- “aux” frequency rank
- 64776
- confusion score
Side-by-Side Comparison
| Feature | AUC | aux |
|---|---|---|
| Definition | According to the Roman era, which reckons the number of years passed from the foundation of the city of Rome by Romulus, now usually taken as 753 bc. | Abbreviation of auxiliary. |
Where the spellings diverge
Shared letters are muted; the letters that actually set AUC and aux apart are highlighted. They share 2 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
AUC and aux form a confusable pair in the English index, two distinct headwords that are easily confused because they look alike, sound alike, or both. They differ by a single letter - c in “AUC” becomes x in “aux” - close enough that the eye skips over the difference, far enough that meaning fully diverges. Our composite confusion score for this pair is 64776, derived from the frequency rank of both members and their visual similarity.
AUC is recorded at frequency rank #48,600, classified as anadv. aux is at rank #16,176, tagged as anadj, pronounced /ˈɔks/.
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 64776, this pair ranks #76,048 of 530,003 scored English confusable pairs - among the most confusable pairs.
Frequency comparison
Frequently Asked Questions
Can "AUC" and "aux" be used interchangeably?
Remembering AUC vs aux
The fastest way to pick the right one every time.
- Check the role first: if you need an adverb, it's “AUC”; for an adjective, it's “aux”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “AUC” entry
- Browse more pairs most likely to be confused. Most confusable