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)
English language
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Examples of substitution class
substitution class
This is not meant as a substitution for the class, but to give the students a better opportunity to prepare for it.
From the dailyherald.com
Then Zhou Jun, a last-minute substitution in the women's 53 kg weight class, found herself in the unusual position of not completing a single successful lift at the Games.
From the olympics.time.com
Class to simplify the replacement of several different regular expressions, each with its own substitution.
From the en.wikipedia.org
That of course could mean substitution of all-coach subway cars and sandwich bars for first-class sleeping cars and gently swaying restaurants-per ardua ad Amtrak.
From the time.com
