Ablative

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The ablative case in Latin is an inflection that applies to nouns, adjectives and participles. The ablative case is sometimes known as the "case of adverbial relation" and the function of the ablative case is sometimes performed in English by prepositional phrases. The ablative can express adverbials of time (in, on, at), manner (by, with), place (in, on, at), cause (for, to) and similar adverbials. Noun phrases in the ablative case are used as the objects of some pronouns. Certain verbs take objects in the ablative as well.

Bennett states that the ablative case represents the merger of three cases and identifies three broad classes of meaning:

1. "Genuine" uses
2. Instrumental
3. Locative (related to place)

The Latin ablative originally marked motion away from something, but later it became a very general adverbial case modifying or limiting nouns by ideas of place, time, manner, cause, instrument, accompaniment etc. Ablative usually, but not always, stands with prepositions (ab, ex, de, cum, in, sub).

Here are the basic and very general rules for making a singular ablative:

• If a word ends in "-us" then the ablative ends in "-o". Tullius becomes Tullio.
• If a word ends in "-a", then the ablative ends in long "-á". Livia becomes Liviá.
• If a word ends in "-o", then the ablative ends in "-one". Cicero becomes Cicerone.
• Many other nouns change their ending to "-e" but their rules are more difficult and are not detailed here. Here are some just for example:

Audens in ablative becomes Audente,

Laenas in ablative is Laenate,

homo in ablative is homine,

consul in ablative is consule,

praetor in ablative is praetore, and so on.

• Some common nouns ending in "-us" change to "-u in ablative, for example:

Senatus in ablative is Senatu,

exercitus" in ablative is exercitu".

Usage in practice

An average Nova Roman citizen uses the ablative case in the consular dating. Learn more about Roman dates.

Forming the ablative in all declensions

	First declension		Second declension
	A-Stem		O-Stem
	mf terra, -ae, f land		mf tribúnus, -í, m tribune		n auspicium, -í, n auspice
	Singular		Singular		Singular
Nominative	terra	——	tribúnus	——	auspicium	——
Accusative	terram	–am	tribúnum	–um	auspicium	——
Genitive	terrae	–ae	tribúní	–í	auspicií	–í
Dative	terrae	–ae	tribúnó	–ó	auspició	–ó
Ablative	terrá	–á	tribúnó	–ó	auspició	–ó
	Plural		Plural		Plural
Nominative	terrae	–ae	tribúní	–í	auspicia	–a
Accusative	terrás	–ás	tribúnós	–ós	auspicia	–a
Genitive	terrárum	–árum	tribúnórum	–órum	auspiciórum	–órum
Dative- Ablative	terrís	–ís	tribúnís	–ís	auspiciís	–ís

	Third declension								Fourth declension
	Consonant Stem				I-Stem				U-Stem
	mf léx, légis, f law		n iús, iúris, n right		mf cívis, -is, mf citizen		n mare, -is, n sea		mf senátus, -ús, m senate		n cornú, -ús, n horn
	Singular		Singular		Singular		Singular		Singular		Singular
Nominative	léx	——	iús	——	cívis	——	mare	——	senátus	——	cornú	——
Accusative	légem	–em	iús	——	cívem	–em	mare	——	senátum	–um	cornú	——
Genitive	légis	–is	iúris	–is	cívis	–is	maris	–is	senátús	–ús	cornús	–ús
Dative	légí	–í	iúrí	–í	cíví	–í	marí	–í	senátuí	–uí	cornú	–ú
Ablative	lége	–e	iúre	–e	cíve	–e	marí	–í	senátú	–ú	cornú	–ú
	Plural		Plural		Plural		Plural		Plural		Plural
Nominative- Accusative	légés	–és	iúra	–a	cívés	–és	maria	–ia	senátús	–ús	cornua	–ua
Genitive	légum	–um	iúrum	–um	cívium	–ium	marium	–ium	senátuum	–uum	cornuum	–uum
Dative- Ablative	légibus	–ibus	iúribus	–ibus	cívibus	–ibus	maribus	–ibus	senátibus	–ibus	cornibus	–ibus

	Fifth declension
	E-Stem
	mf diés, éí, m day
	Singular
Nominative	diés	——
Accusative	diem	–em
Genitive- Dative	diéí	–éí
Ablative	dié	–é
	Plural
Nominative- Accusative	diés	–és
Genitive	diérum	–érum
Dative- Ablative	diébus	–ébus

References