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Webster 1913 Edition

adv.

In a joint manner; together; unitedly; in concert; not separately.

Then

jointly

to the ground their knees they bow.

Shakespeare

adv.

Together; unitedly; in concert; with cooperation.

With union of interest; as, to be jointly concerned in a voyage.

jointly ‎(not comparable)

Together, acting as one; collectively.
They agreed to jointly raise the child, even though they were no longer married.

together

Romanian: împreună (ro)
Russian: совме́стно (ru) ‎(sovméstno), сообща́ (ru) ‎(soobščá), вме́сте (ru) ‎(vméste)
Scottish Gaelic: cuideachd