The Ergative vs. absolutive case reference article from the English Wikipedia on 24-Apr-2004
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Ergative vs. absolutive case

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Cases
Abessive case
Ablative case
Absolutive case
Accusative case
Adessive case
Allative case
Comitative case
Dative case
Dedative case
Elative case
Ergative case
Essive case
Genitive case
Illative case
Inessive case
Instrumental case
Locative case
Nominative case
Oblique case
Partitive case
Possessive case
Postpositional case
Prepositional case
Prolative case
Terminative case
Translative case
Vocative case
Declension
List of cases

The ergative case is used, in ergative-absolutive languages which inflect for case, to mark the subject of a transitive verb.

The absolutive case, in the same context, is used to mark

The ergative case is typically marked (most salient), while the absolutive case is unmarked.

See Morphosyntactic alignment.