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Geometry in Irish (Céimseata): Meaning, Pronunciation, Usage

The Irish for geometry is céimseata, a feminine noun.
Updated October 2026Report a mistake

How to say “geometry” in Irish

Irish:
céimseata
English:
geometry
Word type:
noun
Gender:
feminine, fifth declension
Pronunciation:
“KAYM-shat-uh”  /ˈkeːmʲʃət̪ˠə/
Various forms
Genitive singular:
céimseatan, na céimseatan (e.g. leabhar céimseatan, geometry book)

What does “céimseata” mean?

geometry
The branch of mathematics that studies points, lines, angles, shapes and space.Also: geometrical shapes, plane geometry.

Other Irish words for geometry: geoiméadracht (geometry)

“Céimseata” with the article

Here is céimseata after the article (an t-alt).

an chéimseata
the geometry
Lenition: c becomes ch after an (feminine noun)

“Céimseata” in a sentence: Irish examples

Common Irish sentences using céimseata, the Irish word for geometry.

Is maith liom céimseata níos mó ná ailgéabar.
I like geometry more than algebra.
Bhí an chéimseata deacair inniu.
Geometry was hard today.
Tá scrúdú céimseatan againn amárach.
We have a geometry exam tomorrow.
Chaill mé mo threalamh céimseatan ar scoil.
I lost my geometry set at school.
Tá sí an-mhaith i gcéimseata.
She is very good at geometry.
Foghlaimímid faoi thriantáin sa chéimseata.
We learn about triangles in geometry.
Mhínigh an múinteoir fadhb chéimseatan dúinn.
The teacher explained a geometry problem to us.

Other nouns in Irish

More everyday Irish nouns to learn next.

Geometry in Irish: frequently asked questions

What is the Irish for geometry?

The Irish for geometry is céimseata (pronounced “KAYM-shat-uh”). It’s a feminine noun.

How do you pronounce céimseata in Irish?

Céimseata is said like “KAYM-shat-uh” (IPA /ˈkeːmʲʃət̪ˠə/).

Does céimseata have a plural?

No plural form is given for céimseata in the standard. Many abstract and mass nouns in Irish have no plural.

Why does céimseata change to chéimseata or gcéimseata?

Irish changes the start of some words after certain words. After mo (my) céimseata becomes mo chéimseata (lenition), and after ár (our) or i (in) it becomes ár gcéimseata (eclipsis).

How do I say 'geometry teacher' or 'geometry class' in Irish?

Use the genitive céimseatan after the noun: múinteoir céimseatan (geometry teacher), rang céimseatan (geometry class).

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