Informant (linguistics)
From Infogalactic: the planetary knowledge core
An informant or consultant in linguistics is a native speaker who acts as a linguistic reference for a language being studied. The informant's role is that of a senior interpreter, who demonstrates native pronunciation, provides grammaticality judgments regarding linguistic well-formedness, and may also explain cultural references and other important contextual information to researchers from other cultures studying the language.[1][2]
References
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