overlapping in duration; "concurrently with the conference an exhibition of things associated with Rutherford was held"; "going to school and holding a job at the same time"
a person who contributes to the fulfillment of a need or furtherance of an effort or purpose; "my invaluable assistant"; "they hired additional help to finish the work"
in conjunction with; combined; "our salaries put together couldn't pay for the damage"; "we couldn't pay for the damages with all our salaries put together"
in collaboration or cooperation; "this paper was written jointly"