{"era":"current","word":"gravitational","meaning":"relating to gravity or the force of attraction between masses","children":[{"era":"current","word":"gravity","meaning":"the force of attraction between masses","children":[{"era":"classical","word":"gravitas","meaning":"weight; seriousness; dignity","children":[{"era":"classical","word":"gravis","meaning":"heavy; weighty; serious","children":[],"language":"Latin"}],"language":"Latin"}],"language":"Modern English"}],"language":"Modern English"}