Latin Plurals in English
Latin plurals still live in English.
How It Works
| Singular | Plural | Change |
|---|---|---|
| alumnus | alumni | -us to -i |
| radius | radii | -us to -i |
| datum | data | -um to -a |
| curriculum | curricula | -um to -a |
| formula | formulae | -a to -ae |
English also accepts formulas and curriculums. A woman who studied at a school is an alumna, and several women are alumnae.
The rule helps with Latin too. When you meet curricula in a Latin sentence, it is a neuter plural: more than one curriculum.
The final i of a Latin plural sounds like ee. English says alumni and radii with a long i, but Latin says ah-LOOM-nee and RAH-dee-ee.
Examples (5)
- Alumnus in schola cantat.
The pupil sings in school.
Alumnus is singular. Latin alumnus means a foster child or pupil.
- Alumni in schola cantant.
The pupils sing in school.
Alumni is the plural, from -us to -i, and the verb is plural too.
- Radii in rota sunt.
The spokes are in the wheel.
Radius means a spoke or a ray. Its plural is radii.
- Curricula in circo sunt.
The races are in the circus.
Curriculum is neuter, so the plural ends in -a.
- Formulae in libro sunt.
The rules are in the book.
Formula is a first declension noun, so the plural ends in -ae.
Common Mistakes
Treating a neuter noun in -um like a masculine noun in -us.
Curriculi in circo sunt.Curricula in circo sunt.Curriculum is neuter, so its plural ends in -a. Curriculi is a different form: of the race.
Giving radius the neuter plural.
Radia in rota sunt.Radii in rota sunt.Radius is masculine, so its plural is radii.
How It Connects
Learn This First
English keeps some Latin plurals, so plural nouns and neuter plurals come first.
Related Patterns
- Latin Words in English
More words that English took from Latin.
Foundations - Second Declension: amicus
The nouns that make plurals in -i.
Level 1 - Second Declension Neuter: verbum
The nouns that make plurals in -a.
Level 1 - First Declension: puella
The nouns that make plurals in -ae.
Level 1 - Roots You Already Use
English words built on Latin roots.
Level 4