{"era":"current","word":"sustainable","meaning":"able to be maintained","children":[{"era":"1700s","word":"sustainable","meaning":"capable of being sustained","children":[{"era":"1200s","word":"sustain","meaning":"to hold up, support","children":[{"era":"1100s","word":"sustenir","meaning":"to support, endure","children":[{"era":"classical","word":"sustinere","meaning":"to hold up, support","children":[{"era":"classical","word":"sub-","meaning":"under","children":[],"language":"Latin (prefix)"},{"era":"classical","word":"tenere","meaning":"to hold","children":[],"language":"Latin"}],"language":"Latin"}],"language":"Old French"}],"language":"Middle English"},{"era":"current","word":"-able","meaning":"capable of","children":[],"language":"English (suffix)"}],"language":"English (derived)"}],"language":"Modern English"}