The best definition of parallel structure is :
When a sentence has the same importance and grammatical style used for a series of words, phrases, or clauses in a sentence.
Parallel structure (also called parallelism) is repetitions of selected grammatical forms within a sentence. Create parallel structures by ensuring that each element compared or each idea in a sentence follows the same grammatical pattern. Extraordinary example: Ellen likes hiking, rodeos and naps.
Parallel structure means using the same word pattern to indicate the equal importance of two or more ideas. This can be done at the word, sentence, or phrase level. The usual way to connect parallel constructs is with coordinating conjunctions such as "and" and "or".
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