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Addition in Irish (Suimiú): Meaning, Pronunciation, Usage

The Irish for addition is suimiú, a masculine noun (plural suimithe). Ag suimiú is adding, from the verb suimigh.
Updated October 2026Report a mistake

How to say “addition” in Irish

Irish:
suimiú
English:
addition
Word type:
noun (verbal noun)
Verbal noun of:
suimigh, to add (ag suimiú, adding)
Gender:
masculine
Pronunciation:
“SIM-oo”  /ˈsˠɪmʲuː/
Various forms
Plural:
suimithe (additions)
Genitive singular:
suimithe, an tsuimithe (e.g. comhartha suimithe, addition sign)
Genitive plural:
suimithe, na suimithe (e.g. toradh na suimithe, the result of the additions)

What does “suimiú” mean?

addition
The act of adding numbers together; the verbal noun of the verb suimigh, to add or sum.Also: adding, summing, summation, sum.

Other Irish words for addition: breis (increase)

“Suimiú” as a verbal noun

After ag, suimiú means adding: it is the verbal noun of the verb suimigh (to add). A noun that follows it goes into the genitive.

agat
+
suimiúverbal noun
=
ag suimiúadding

“Suimiú” with the article

The plural of addition in Irish is suimithe. Here is suimiú after the article (an t-alt), in the singular and the plural.

an suimiú
the addition
No change after an
na suimithe
the additions
Plural: no change after na

“Suimiú” in a sentence: Irish examples

Common Irish sentences using suimiú, the Irish word for addition.

Tá an suimiú éasca do na páistí.
Addition is easy for the children.
Rinneamar suimiú agus dealú ar scoil inniu.
We did addition and subtraction at school today.
Bhí botún i mo shuimiú.
There was a mistake in my addition.
Scríobh sé comhartha suimithe idir an dá uimhir.
He wrote a plus sign between the two numbers.
Is fearr léi suimiú ná roinnt.
She prefers addition to division.
Déan na suimithe seo sa chóipleabhar.
Do these additions in the copybook.
Tá an t-áireamhán úsáideach le haghaidh suimithe.
The calculator is useful for addition.

Other nouns in Irish

More everyday Irish nouns to learn next.

Addition in Irish: frequently asked questions

What is the Irish for addition?

The Irish for addition is suimiú (pronounced “SIM-oo”). It’s a masculine noun and the plural is suimithe.

How do you pronounce suimiú in Irish?

Suimiú is said like “SIM-oo” (IPA /ˈsˠɪmʲuː/).

What is the plural of addition in Irish?

The plural of suimiú is suimithe; with the article, na suimithe means “the additions”. The genitive plural is suimithe, as in toradh na suimithe (the result of the additions).

Why does suimiú change to shuimiú?

After words like mo (my) and do (your) the first letter is lenited: mo shuimiú. After ár (our) it stays ár suimiú, because s does not take eclipsis.

What is the difference between suimiú and suim?

Suimiú is the act of adding, addition, while suim is the sum or total, and also means interest, as in tá suim agam ann.

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