{"era":"current","word":"pollution","meaning":"The presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.","children":[{"era":"1200s","word":"pollution","meaning":"defilement","children":[{"era":"classical","word":"pollutio","meaning":"a washing over, defilement","children":[{"era":"classical","word":"polluere","meaning":"to soil, defile","children":[],"language":"Latin"}],"language":"Latin"}],"language":"Old French"}],"language":"Modern English"}