Plural of focus
irregular plural
The plural of focus is foci, focuses or focusses.
Forms of focus
| Singular | focus /ˈfəʊ̯.kəs/ |
|---|---|
| Plural | foci /ˈfəʊ.kaɪ/ focuses /ˈfəʊ.kə.sɪz/ focusses |
| Countable | countable and uncountable |
Foci and focuses in a sentence
- The camera focuses automatically on the subject's eyes.
- This protein is monoubiquitinated in response to DNA damage, resulting in its localization to nuclear foci with other proteins involved in homology-directed DNA repair.From the entry monoubiquitinated
- Foci of fat on MRI are strongly suggestive of this diagnosis.2018, Crombé A, Loarer FL, Alberti N, Buy X, Stoeckle E, Cousin S, Toulmonde M, Coindre JM, Italiano A, Kind M, “Homogeneous myxoid…. From the entry myxoid
- There are two marked stimulation sites lateral to V1, showing that the lateral secondary foci were located extrastriatally.2015 August 1, “In Vivo Voltage-Sensitive Dye Study of Lateral Spreading of Cortical Activity in Mouse Primary Visual Cortex Induced by a…. From the entry extrastriatally
- In opposition to romantopia and intimatopia and their respective romance and intimacy foci, paratopia’s interest in the fantastic is more radical.2009, Joseph Carl Linden Brennan (October 2009), I am your worst fear, I am your best fantasy: new approaches to slash fiction (PDF), BA…. From the entry romantopia
Meaning of focus
- noun A point at which reflected or refracted rays of light converge.
- noun A point of a conic at which rays reflected from a curve or surface converge.
- noun The fact of the convergence of light on the photographic medium.
Nouns ending in -us: plural -i
Questions about the plural of focus
- What is the plural of focus?
- The plural of focus is foci, focuses or focusses.
- Which is correct, foci or focuses?
- Both are used. focuses is the more common of the two in English writing.
- Is focus countable?
- Focus is a countable and uncountable noun.
Source and license
Adapted from Wiktionary: focus (page history and authors) and the entries of its forms. Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws left out forms marked obsolete, archaic, rare or dialectal and added the examples. Wiktionary data of 2026-09-02.
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Cite this page: “Plural of focus.” Word.ws, https://word.ws/plural/focus. Based on Wiktionary, CC BY-SA 4.0.