The state or quality of being concomitant; the condition of accompanying or existing together.
A variant form of concomitance, derived from the same Latin root concomitari, with the -ancy suffix added to create an alternative noun form emphasizing the abstract quality.
While concomitance and concomitancy mean nearly the same thing, concomitancy is rarer and more formal—it's the kind of word a 19th-century naturalist might use in a detailed scientific journal to sound extra precise.
Complete word intelligence in one call. Free tier — 50 lookups/day.