User:Marcas.oduinn/Published/NounsFourth/180128

The Irish fourth declension is made up primarily of masculine nouns; however, abstract nouns ending in a vowel tend to be feminine (eagla, aigne). The nominative singular can end in: a vowel; the diminutive suffix -ín (cailín); a few that end in a consonant (bus, ainm).

There is no special form for the genitive singular. The dative and vocative singular are likewise identical to the nominative singular.

The fourth declension plurals are strong plurals with very few exceptions.

Strong plurals
A strong plural is characterised by the genitive plural maintaining the same form as the nominative plural.

Strong plural forms found in the fourth declension are:
 * -a/-e: - aí/-í
 * -ín: -iní
 * -le/-ne: -lte/-nte
 * -í, -aoi, -é: -the
 * also:
 * -nna
 * -(n)(e)acha

The first two are the most common.

Weak plurals
A weak plural is characterised by the genitive plural having the same form as the nominative singular. There are only a couple of exceptional nouns classed as such in the fourth declension.

Similarly:
 * , gen. sg., nom. pl. , gen. pl. – grace

Feminine nouns
As a general rule, nouns of the fourth declension are masculine.

The feminine nouns are:
 * Most abstract nouns ending in a vowel:
 * ,, , etc.
 * exceptions:
 * Female personal names ending in -ín
 * Máirín, Nóirín.
 * Concrete nouns that are nonetheless feminine
 * (lit.)
 * Concrete nouns that are nonetheless feminine
 * (lit.)

Female nouns
For female nouns of masculine gender, the referential pronoun is feminine: is cailín í.

Nouns ending in consonants other than -ín
Most nouns of the fourth declension end in vowels or -ín. Nouns with other, consonant endings (with their plural form) include:


 * , ainmneacha
 * , bruacha
 * , busanna
 * , cailifí
 * , ciceanna
 * (gang), cleasanna
 * , cliamhaineacha
 * , danhtanna
 * , dosaenacha
 * , Eanáirí
 * , éimírí
 * , fabhtanna
 * , gildeanna
 * , Iúilí
 * , Máirteanna
 * , máistrí
 * (amount), -
 * , moscanna
 * , saibhre
 * , sáirsintí
 * , seilfeanna
 * , seochanna
 * , stadanna
 * , téacsanna
 * , uncailí
 * , veaineanna
 * , veisteanna
 * -eas,-iam (modern technical jargon via Latin -us, -ium)
 * e.g. úráinium, víreas
 * -blast, -clast (modern technical jargon via Greek  )
 * , veaineanna
 * , veisteanna
 * -eas,-iam (modern technical jargon via Latin -us, -ium)
 * e.g. úráinium, víreas
 * -blast, -clast (modern technical jargon via Greek  )

Nouns in other declensions ending in vowels
Nouns listed in italics have forms in both the fourth and other declensions.

Fifth Declension

 * (lit.)
 * (lit.)
 * (lit.)
 * (lit.)
 * (lit.)
 * (lit.)
 * (lit.)
 * (lit.)
 * (lit.)
 * (lit.)
 * (lit.)