substitution class

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Noun1.substitution class - the class of all items that can be substituted into the same position (or slot) in a grammatical sentence (are in paradigmatic relation with one another)
category, class, family - a collection of things sharing a common attribute; "there are two classes of detergents"
References in periodicals archive ?
The management has also decided to give SR15 for holding substitution class, while teachers working on Thursdays will be paid SR50 per period.
The serious problems arise when we ask how to determine the substitution class for `p'.
With appeals to semantic notions off limits, attempts to solve them force ever tighter restrictions on the substitution class for `p' so that, for example, in the end even my own past and future ways of speaking have to be treated as if they were foreign languages.