{"era":"current","word":"revolution","meaning":"overthrow of a system","children":[{"era":"1200s","word":"revolution","meaning":"a turning around","children":[{"era":"post-classical","word":"revolutio","meaning":"a revolving, a return","children":[{"era":"classical","word":"revolvere","meaning":"to roll back, turn around","children":[{"era":"classical","word":"re-","meaning":"back, again","children":[],"language":"Latin"},{"era":"classical","word":"volvere","meaning":"to roll","children":[{"era":"proto","word":"*wel-","meaning":"to turn, to roll","children":[],"language":"Proto-Indo-European"}],"language":"Latin"}],"language":"Latin"}],"language":"Late Latin"}],"language":"Old French"}],"language":"Modern English"}