noun

(1) The act of making and return or doing something in return,alternating back-and-forth movement,mutual interaction,the activity of interchanging or reciprocating,retaliation

(2) The act of making and return or doing something in return

(3) Alternating back-and-forth movement

(4) Mutual interaction

(5) The activity of interchanging or reciprocating

(6) Retaliation