{"era":"current","word":"costly","meaning":"Expensive or involving a high cost.","children":[{"era":"1300s","word":"cost","meaning":"price, expense","children":[{"era":"1200s","word":"coste / coster","meaning":"cost, to cost","children":[{"era":"classical","word":"constare","meaning":"to stand firm; to cost, stand at a fixed price","children":[],"language":"Latin"}],"language":"Old French"}],"language":"Middle English"},{"era":"pre-1100","word":"-ly","meaning":"adverb/adjective-forming suffix","children":[],"language":"Old English"}],"language":"Modern English"}