-ius

See also: ius, Ius, and IUs

Latin

Pronunciation

• (Classical Latin) IPA^(key): /i.us/, [iʊs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /i.us/, [ius] (stressed on the antepenult)

Etymology 1

From Old Latin -ios, from Proto-Indo-European *-yós.

Suffix

-ius (feminine -ia, neuter -ium); first/second-declension suffix

1. forming adjectives from nouns

Declension

First/second-declension adjective.

Number	Singular				Plural
Case / Gender	Masculine	Feminine	Neuter		Masculine	Feminine	Neuter
Nominative	-ius	-ia	-ium		-iī	-iae	-ia
Genitive	-iī	-iae	-iī		-iōrum	-iārum	-iōrum
Dative	-iō		-iō		-iīs
Accusative	-ium	-iam	-ium		-iōs	-iās	-ia
Ablative	-iō	-iā	-iō		-iīs
Vocative	-ie	-ia	-ium		-iī	-iae	-ia

Usage notes

The suffix -ius is added to a noun to form an adjective indicating "made of" or "belonging to" that noun.

Examples:

‎pater (“father”) + ‎-ius → ‎patrius (“paternal”)

‎rēx (“king, ruler”) + ‎-ius → ‎rēgius (“kingly, royal”)

‎uxor (“wife”) + ‎-ius → ‎uxōrius (“uxorious”)

Derived terms

• -ium

Latin terms suffixed with -ius

Synonyms

• -āceus
• -āneus
• -ticus

References

• “-ius” on page 986/1 of the Oxford Latin Dictionary (1st ed., 1968–82)

Etymology 2

See -ior (suffix forming adjectives’ comparative degrees).

Suffix

1. nominative neuter singular of -ior
2. accusative neuter singular of -ior
3. vocative neuter singular of -ior

Etymology 3

See -ō (suffix forming adverbs).

Suffix

1. comparative degree of -ō

Etymology 4

From Proto-Italic *-osjo, itself from Proto-Indo-European *-ósyo, genitive case suffix.

Suffix

1. genitive suffix for some irregular pronouns.

Usage notes

It is only used in specific irregular pronouns for the genetive case.

Examples

qui, cuius

hic, huius

is, eius