This chapter sets out semantic and analytic parameters for understanding evidentials—closed grammatical sets whose main meaning is information source. A noun phrase may have its own evidentiality specification, different from that of a verb. Other means of expressing information source offer open-ended options in terms of their semantics, and can be more flexible in their scope. Evidentiality is distinct from tense, aspect, modality, mirativity, and egophoricity. An evidential can be questioned or be within the scope of negation. The concept of evidentiality is different from the lay person’s notion of ‘evidence’. Evidentiality involves numerous semantic parameters and cannot be reduced to a simplistic ‘direct’ versus ‘indirect’ opposition. Evidentiality needs to be worked out inductively, based on painstaking work with primary materials on a language, rather than on translation and elicitation. Guidelines for fieldworkers investigating evidentials are offered in the Appendix, alongside a glossary of terms.

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The range of mirative meanings across the world's languages subsumes sudden discovery, surprise, and unprepared mind of the speaker (and also the audience or the main character of a story). Mirative markers may also convey overtones of counterexpectation and new information. The range of mirative meanings may be expressed through a verbal affix, a complex predicate, or a pronoun. Evidentials whose major function is to express information source may have mirative extensions, especially in the context of the 1st person subject. The mirative category appears to be susceptible to linguistic diffusion.

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