(n.) Reciprocal relation; corresponding similarity or parallelism of relation or law; capacity of being converted into, or of giving place to, one another, under certain conditions; as, the correlation of forces, or of zymotic diseases.

allegory analogy balancing comparative anatomy comparative degree comparative grammar comparative judgment comparative linguistics comparative literature comparative method compare comparing comparison confrontation confrontment contingency contrast contrastiveness dependence distinction distinctiveness interrelation likening matching metaphor opposing opposition parallelism proportion relation relativity simile similitude trope of comparison weighing