-ius

Alternative formsEdit

• -eus

EtymologyEdit

Evolution and sound change from Old Latin *-os, *-ios, itself a conservative version of a Proto-Indo-European thematic case ending.

PronunciationEdit

• (Classical) IPA^(key): /i.us/ (stress falls on the antepenult)

SuffixEdit

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

1. forming adjectives from nouns

DeclensionEdit

First/second declension.

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	-iae	-iō		-iīs	-iīs	-iīs
accusative	-ium	-iam	-ium		-iōs	-iās	-ia
ablative	-iō	-iā	-iō		-iīs	-iīs	-iīs
vocative	-ie	-ia	-ium		-iī	-iae	-ia

Usage notesEdit

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

Examples:

patrius (“paternal”), from pater (“father”)

rēgius (“kingly, royal”), from rēx (“king, ruler”)

uxōrius (“uxorious”), from uxor (“wife”)

Derived termsEdit

• -ium

SynonymsEdit

• -āceus, -āneus, -ticus

ReferencesEdit

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