jointly
adverb
[ ˈdʒɔɪntli ]
• with another person or people; together.
• "a report prepared jointly by Harvard and Yale universities"
Similar:
together,
in partnership,
in cooperation,
cooperatively,
in collaboration,
in conjunction,
in concert,
in combination,
as one,
mutually,
in alliance,
in league,
in collusion,
in cahoots,