Noun

1. The state or condition of being parallel; agreement in direction, tendency, or character.
2. Agreement or similarity; resemblance; correspondence; analogy; likeness.
3. A parallel position; the relation of parallels.
4. The juxtaposition of two or more identical or equivalent syntactic constructions, especially those expressing the same sentiment with slight modifications, introduced for rhetorical effect.
5. The doctrine that matter and mind do not causally interact but that physiological events in the brain or body nonetheless occur simultaneously with matching events in the mind.