retrograde

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retrograde

1. Astronomy
a. occurring or orbiting in a direction opposite to that of the earth's motion around the sun
b. occurring or orbiting in a direction around a planet opposite to the planet's rotational direction
c. appearing to move in a clockwise direction due to the rotational period exceeding the period of revolution around the sun
2. Biology tending to retrogress; degenerate
3. Music of, concerning, or denoting a melody or part that is played backwards