conjointly

in or by combined action or effort the two departments worked conjointly to finish the project in less than half the usual time Synonyms concertedly, together, hand in glove (or hand and glove), jointlyRelated Words collectively, mutually, reciprocally, unanimously, unitedly; cooperatively, symbioticallyAntonyms apart, independently, individually, separately, severally, single-handed, single-handedly, singly, solely, unaided, unassisted, unilaterally