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Octave in Irish (Ochtach): Meaning, Pronunciation, Usage

The Irish for octave is ochtach, a masculine noun (plural ochtacha).
Updated October 2026Report a mistake

How to say “octave” in Irish

Irish:
ochtach
English:
octave
Word type:
noun
Gender:
masculine, first declension
Pronunciation:
“OKH-tukh”  /ˈɔxt̪ˠəx/
Various forms
Plural:
ochtacha (octaves)
Genitive singular:
ochtaí, an ochtaí (e.g. barr an ochtaí, the top of the octave)
Genitive plural:
ochtach, na n-ochtach (e.g. raon na n-ochtach, the range of the octaves)

What does “ochtach” mean?

octave
In music, the interval of eight notes between one note and the next note of the same name, higher or lower.Also: musical octave, eighth.

“Ochtach” with the article

The plural of octave in Irish is ochtacha. Here is ochtach after the article (an t-alt), in the singular and the plural.

an t-ochtach
the octave
Masculine nouns take t before a vowel after an
na hochtacha
the octaves
Plural: na adds h before a vowel

“Ochtach” in a sentence: Irish examples

Common Irish sentences using ochtach, the Irish word for octave.

Is ionann ochtach agus ocht nóta.
An octave spans eight notes.
Seinn an port ochtach níos airde.
Play the tune an octave higher.
Tá raon trí ochtach ag an amhránaí sin.
That singer has a range of three octaves.
Thit a guth ochtach iomlán.
Her voice dropped a whole octave.
Tá na hochtacha marcáilte ar an bpianó.
The octaves are marked on the piano.
Chan sé an nóta deireanach san ochtach íochtarach.
He sang the last note in the lower octave.
D'fhoghlaim mé scála ochtaí amháin inniu.
I learned a one-octave scale today.

Other nouns in Irish

More everyday Irish nouns to learn next.

Octave in Irish: frequently asked questions

What is the Irish for octave?

The Irish for octave is ochtach (pronounced “OKH-tukh”). It’s a masculine noun and the plural is ochtacha.

How do you pronounce ochtach in Irish?

Ochtach is said like “OKH-tukh” (IPA /ˈɔxt̪ˠəx/).

What is the plural of octave in Irish?

The plural of ochtach is ochtacha; with the article, na hochtacha means “the octaves”. The genitive plural is ochtach, as in raon na n-ochtach (the range of the octaves).

Why does ochtach sometimes have a t or h in front of it?

Irish nouns beginning with a vowel take a prefix after certain words: an t-ochtach (the octave), a hochtach (her octave), a n-ochtach (their octave), na hochtacha (the octaves).

Is 'ochtach' related to 'ocht'?

Yes, 'ochtach' comes from 'ocht' (eight), because an octave covers eight notes of the scale.

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