This word is acceptable for play in the UK dictionary that is being used in the following games:

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n. The condition of being concomitant

n. concomitance

"This I think, can rarely exist without the concomitancy of judgment; for how we can be said to have discovered the true essence of two things, without discerning their difference, seems to me hard to conceive."

concomitant    concomitantly    concomitants