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Adjective: reciprocatory  ri'si-pru-ku,to-ree [N. Amer], ri'si-pru-ku-t(u-)ree [Brit]
  1. Given, done or owed to each other
    "Their reciprocatory gestures of goodwill improved diplomatic relations";
    - reciprocative
     
  2. Moving alternately backward and forward
    "The reciprocatory motion of the piston drove the engine";
    - reciprocative

See also: mutual, reciprocal