pinion āļāļ·āļāļāļ°āđāļĢ pinion āļāļ·āļāļāļ°āđāļĢ The wing of a bird.The outer rear edge of the wing of a bird, containing the primary feathers.A primary feather of a bird. To remove or bind the wing feathers of (a bird) to prevent flight.To cut or bind (the wings of a bird).To restrain or immobilize (a person) by binding the arms.To bind (a person's arms).To bind fast or hold down; shackle.A small cogwheel that engages or is engaged by a larger cogwheel or a rack.