{"era":"current","word":"certificates","meaning":"official documents conferring rights or confirming facts","children":[{"era":"1500s","word":"certificate","meaning":"an official document","children":[{"era":"1200s","word":"certificare","meaning":"to make certain, to assure","children":[{"era":"classical","word":"certus + facere","meaning":"certain + to make","children":[],"language":"Latin"}],"language":"Medieval Latin"}],"language":"Middle English"}],"language":"Modern English"}