Ergative case parameter
Encyclopedia
In linguistics
Linguistics
Linguistics is the scientific study of human language. Linguistics can be broadly broken into three categories or subfields of study: language form, language meaning, and language in context....

, the ergative case parameter is a proposed parameter
Principles and parameters
Principles and parameters is a framework within generative linguistics in which the syntax of a natural language is described in accordance with general principles and specific parameters that for particular languages are either turned on or off...

 that classifies a language as ergative-absolutive or nominative-accusative
Nominative-accusative language
Nominative-accusative is a form of morphosyntactic alignment in which subjects of transitive and intransitive verbs are distinguished from objects of transitive verbs through word order, case marking, and/or verb agreement...

accordingly to how nouns are declined as subjects or objects of a sentence.
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