Synonyms for Concomitantly:

adv.

jointly (adverb)
concurrently, simultaneously, Connectedly, coincidentally.
relationally (adverb)
analogously, germanely, Adjunctly, Of, supplementally, coincidentally, Connectedly, relevantly, attendantly, Dependently.
simultaneously (adverb)
contemporaneously, simultaneously, synchronously, concurrently.
together (adverb)
contemporaneously.

adv

relationally (adverb)
analogously, germanely, Adjunctly, Of, supplementally, coincidentally, Connectedly, relevantly, attendantly, Dependently.
simultaneously (adverb)
contemporaneously, coincidentally, simultaneously, synchronously, concurrently.
together (adverb)
contemporaneously.

Other synonyms:

adv
coincidentally, Connectedly.