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Approximation in Irish (Neastachán): Meaning, Pronunciation, Usage

The Irish for approximation is neastachán, a masculine noun (plural neastacháin).
Updated October 2026Report a mistake

How to say “approximation” in Irish

Irish:
neastachán
English:
approximation
Word type:
noun
Gender:
masculine, first declension
Pronunciation:
“NAS-tuh-khawn”  /nʲasˠt̪ˠəxaːnˠ/
Various forms
Plural:
neastacháin (approximations)
Genitive singular:
neastacháin, an neastacháin (e.g. cruinneas an neastacháin, the accuracy of the approximation)
Genitive plural:
neastachán, na neastachán (e.g. cruinneas na neastachán, the accuracy of the approximations)

What does “neastachán” mean?

approximation
A value or result that is close to the correct one but not exact, especially in mathematics.Also: approximate value, estimate, rough figure.

“Neastachán” with the article

The plural of approximation in Irish is neastacháin. Here is neastachán after the article (an t-alt), in the singular and the plural.

an neastachán
the approximation
No change after an
na neastacháin
the approximations
Plural: no change after na

“Neastachán” in a sentence: Irish examples

Common Irish sentences using neastachán, the Irish word for approximation.

Níl ansin ach neastachán, ní freagra cruinn é.
That is only an approximation, not an exact answer.
Is neastachán maith é 3.14 ar luach pí.
3.14 is a good approximation of the value of pi.
Tá an neastachán seo ceart go dtí dhá ionad dheachúlacha.
This approximation is correct to two decimal places.
Ríomh an múinteoir earráid an neastacháin ar an gclár.
The teacher calculated the error of the approximation on the board.
Thug na daltaí neastacháin éagsúla ar an bhfad.
The pupils gave different approximations of the distance.
I mo neastachán féin, tá céad duine ann.
By my own approximation, there are a hundred people there.
Úsáidtear neastacháin go minic san innealtóireacht.
Approximations are often used in engineering.

Other nouns in Irish

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Approximation in Irish: frequently asked questions

What is the Irish for approximation?

The Irish for approximation is neastachán (pronounced “NAS-tuh-khawn”). It’s a masculine noun and the plural is neastacháin.

How do you pronounce neastachán in Irish?

Neastachán is said like “NAS-tuh-khawn” (IPA /nʲasˠt̪ˠəxaːnˠ/).

What is the plural of approximation in Irish?

The plural of neastachán is neastacháin; with the article, na neastacháin means “the approximations”. The genitive plural is neastachán, as in cruinneas na neastachán (the accuracy of the approximations).

What is the difference between 'neastachán' and 'meastachán'?

'Neastachán' is an approximation, a value close to the true one, while 'meastachán' is an estimate, a judgement or guess of an amount or cost.

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