Absolutive case is the case of nouns in ergative-absolutive languages that would generally be the subjects of intransitive verbs or the objects of transitive verbs in the translational equivalents of nominative-accusative languages such as English.
Absolutive case is less likely to be formally indicated on the noun than ergative case is.
Crystal, David. 1985.A dictionary of linguistics and phonetics. 2nd edition. New York: Basil Blackwell.
Andrews, Avery. 1985. "The major functions of the noun phrase." In Shopen 1985b
Anderson, Stephen R. 1985. "Inflectional morphology." In Shopen 1985d