-acht

See also: acht, Acht, ächt, and åcht

Irish

Alternative forms

• -eacht (slender variant)
• -ocht (following 'í')

Etymology

From Old Irish -acht (compare Scottish Gaelic -achd).

Suffix

-acht f

1. Nominal suffix, used to form abstract ideas or nouns roughly corresponding to English -ness, -hood, -ity, or -ure.

Usage notes

• This affix forms feminine nouns of the third declension. Abstract nouns do not have plural forms; however, concepts that refer to concrete items do have plurals in -aí.

Declension

Abstract nouns

Declension of -acht

Third declension

Bare forms (no plural for this noun): Case Singular Nominative -acht Vocative a -acht Genitive -achta Dative -acht

Forms with the definite article: Case Singular Nominative an -acht Genitive na -achta Dative leis an -acht don -acht

Concrete nouns

Declension of -acht

Third declension

Bare forms: Case Singular Plural Nominative -acht -achtaí Vocative a -acht a -achtaí Genitive -achta -achtaí Dative -acht -achtaí

Forms with the definite article: Case Singular Plural Nominative an -acht na -achtaí Genitive na -achta na -achtaí Dative leis an -acht don -acht leis na -achtaí

Derived terms

Irish terms suffixed with -acht

Old Irish

Etymology

From Proto-Celtic *-axtā, suffixal use of Proto-Celtic *axtā.

Suffix

-acht f

1. -ness, -hood; forms abstract nouns.

Usage notes

After a palatalised consonant, the suffix becomes -echt.

Inflection

Feminine ā-stem
	Singular	Dual	Plural
Nominative	-achtL	-achtL	-achtaH
Vocative	-achtL	-achtL	-achtaH
Accusative	-achtN	-achtL	-achtaH
Genitive	-achtaeH	-achtL	-achtN
Dative	-achtL	-achtaib	-achtaib
Initial mutations of a following adjective: H = triggers aspiration L = triggers lenition N = triggers nasalization

Derived terms

Old Irish terms suffixed with -acht

Descendants

• Irish: -acht
• Manx: -aght
• Scottish Gaelic: -achd