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Parallelism (grammar) In grammar, parallelism, also known as parallel structure or parallel construction, is a balance within one or more sentences of similar phrases or clauses that have the same grammatical structure. The application of parallelism improves writing style and readability, and is thought to make sentences easier to process.
Definition. In grammar, parallelism is the similarity of structure in a pair or series of related words, phrases, or clauses. Also called parallel structure or isocolon.By convention, items in a series appear in parallel grammatical form: a noun is listed with other nouns, an-ing form with other-ing forms, and so on.y convention, items in a series appear in parallel grammatical form: a noun is listed with other nouns, an-ing form with other-ing forms, and so on.