(of) a statement expressing 'Yes', agreement etc or one that is true, real etc as in 'The answer is (in the) affirmative

being agreeable or assenting

an arrangement or understanding (spoken or written) made by two or more people, governments etc

concurrence

the total value of everything except one variable

cooperative

having the same size and shape

agreeable, harmonious

willing to cooperate

joint, unified

happening or done at the same time

happening at about the same time

happening at about the same time

happening at about the same time