Which to use
“cilia” is a noun and “circa” is a preposition - they look or sound alike but fill different roles in a sentence.
- #44,117
- “cilia” frequency rank
- #13,480
- “circa” frequency rank
- 57597
- confusion score
Side-by-Side Comparison
| Feature | cilia | circa |
|---|---|---|
| Definition | plural of cilium | Approximately, about, around (typically in relation to time) |
Where the spellings diverge
Shared letters are muted; the letters that actually set cilia and circa apart are highlighted. They share 3 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
cilia and circa form a confusable pair in the English index, two distinct headwords that are easily confused because they look alike, sound alike, or both. They share most of their letters but differ in 2 positions - close enough that the eye skips over the difference, far enough that meaning fully diverges. Our composite confusion score for this pair is 57597, derived from the frequency rank of both members and their visual similarity.
cilia is recorded at frequency rank #44,117, classified as anoun, pronounced /ˈsɪ.li.ə/. circa is at rank #13,480, tagged as aprep, pronounced /ˈsɜːkə/.
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 57597, this pair ranks #118,262 of 530,003 scored English confusable pairs - among the most confusable pairs.
Frequency comparison
Frequently Asked Questions
Can "cilia" and "circa" be used interchangeably?
Remembering cilia vs circa
The fastest way to pick the right one every time.
- Check the role first: if you need a noun, it's “cilia”; for a preposition, it's “circa”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “cilia” entry
- Browse more pairs most likely to be confused. Most confusable