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What’s the Plural of Locus?

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What’s the plural of “locus”?

Loci (pronounced lowk-eye) and locuses are both correct to mean the plural of locus, which refers to “the place where it happens or the most important area or point with which it is associated”.

👍🏼Usage Note

I have known her for five years. (present perfect)
She knew the answer immediately. (simple past)
I have knew her for five years. (incorrect past participle)
She has know the answer. (incorrect verb form)

What’s the singular of locus?

Locus is singular for loci.

What does the word locus mean?

Collins Dictionary on locus: “The locus of something is the place where it happens or the most important area or point with which it is associated”.

Other Latin nouns in English

singular plural
locus loci
octopus octopi (or octopuses)
radius radi (or radiuses)
fungus fungi (or funguses)
alumnus alumni (or almunuses)
syllabus syllabi (or syllabuses)
Latin nouns ending in –us/-i. Chart by Grammarflex.

💡Study Tip

Practice using the verb in different tenses with example sentences to memorize the correct forms.

“Locus”, singular, used in sentences

1. The locus of points equidistant from a given point is a circle.

2. People with an external locus of control believe in fate; those with an internal locus believe they have full control over their future.

3. Barcelona is the locus of Spanish industry.

4. Thereafter, the military remained the locus of real power.

“Loci”, plural, used in sentences

1. Unlike composite interval mapping, the set of controlled loci will necessarily vary for each marker and interval.

2. We reordered approximately 32 loci on chromosome 15 to improve linkage statistics.

3. After her death, the house in Rathgar lost for him its genius loci.

4. We do this for all pairs of loci.

5. Mutations in microsatellite loci may be responsible for some heterozygosity.

Origin of the word locus

From etymology online on locus (n.) (plural loci):

1715, “place, spot, locality,” from Latin locus “a place, spot; appointed place, position; locality, region, country; degree, rank, order; topic, subject,” from Old Latin stlocus.

Read more about nouns

Types of nouns What’s the plural of …?
plural-only nouns …moose?
mass nouns …octopus?
collective nouns …cactus?
abstract nouns vs. concrete nouns …analysis?
possessive nouns …curriculum?
regular and irregular nouns …crisis?

Worksheet

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Frequently Asked Questions

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Techniques writers use to enhance their writing and convey messages effectively.

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Literary devices are specific to creative writing, while rhetorical devices are broader.

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Practice identifying them in texts you read regularly.

Sources

  1. Definition of locus.
  2. Sentences using locus.
  3. Origin of locus.

Grammar Expert. "Whats The Plural Of Locus." GrammarFlex, May 31, 2025, https://www.grammarflex.com/whats-the-plural-of-locus/.

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