Variant spelling of concomitantly; in a manner that accompanies or occurs together.
The adverbial form of the rare variant concommitant (with double m), preserving the same spelling variation and identical meaning to its standard form.
Like its adjective form concommitant, this double-m adverb is a historical spelling variant that rarely appears in modern texts, but when you spot it in digitized old books, it's a time capsule of how fluid English spelling once was.
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