Feature (linguistics)
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A feature is a concept applied to several fields of linguistics involving the assignment of binary or unary conditions which act as constraints.
Examples of phonemic features are [+/- voice], [+/- ATR] (binary features) and [coronal] (unary feature, a place feature).
Surface representations can be expressed as the result of rules acting on the features of the underlying representation. These rules are formulated in terms of transformations on features.