(something given for) compensating

repayment; rectification

(an act of) connecting

person who aids another in achieving goal

the willingness shown by, an act of, working or acting together for a common purpose

mutual effort

(an instance, act, of) exchanging things

trade; deal

the effect of two things on each other

interaction

the state of being similar; a point or part in which there is likeness

likeness, correspondence

together; in the same pitch

harmony