jointly
adv.together with one or more other people. You use this when two or more people share the work or the cost of something.
adv.in a shared manner or in collaboration with others. Often used in legal or formal contexts to describe shared ownership or responsibility.
“The two companies jointly developed the new software.”
“The property is owned jointly by the three siblings, meaning they must all agree before it can be sold.”
“The research paper was published jointly by scientists from several international universities, reflecting a decade of cross-border cooperation in the field of renewable energy.”
Typically placed before the verb it modifies or at the end of the clause.
Jointly is an adverb and cannot function as a verb; it must modify an action.
“The league has also partnered with the campaign I am one of the 89% who want to stop global warming , promoted jointly by the United Nations and Japanese media organizations.”
“There is change in the dugout, too, with Chris Cohen and Tom Shaw jointly taking over from Michael Skubala, but some things remain the same.”
From joint + -ly.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.