synchronically

accordingly collectively cooperatively in tandem mutually simultaneously together unitedly

conjointly

agreeably alike arm in arm coincidentally combined companionably concomitantly concurrently connectedly en masse hand in glove hand in hand harmoniously in a group in common in company with in concert in conjunction in league in partnership in unison inextricably inseparably intimately reciprocally side by side similarly with one another

singly

all at once all together as one at one fell swoop closely coincidentally collectively combined commonly concertedly concomitantly concurrently conjointly contemporaneously en masse hand in glove hand in hand in a body in concert in cooperation in one breath in sync in tandem in unison jointly mutually on the beat side by side simultaneously unanimously unitedly with one accord with one voice with the beat

closely collectively in tandem jointly simultaneously

unitedly

all together as one at one fell swoop coincidentally combined commonly concertedly concomitantly concurrently conjointly contemporaneously en masse hand in glove hand in hand in a body in concert in cooperation in one breath in sync in unison mutually on the beat side by side unanimously with one accord with one voice with the beat

apart individually separately