{"era":"current","word":"kilometre","meaning":"a unit of length equal to 1,000 metres","children":[{"era":"1790s","word":"French kilomètre","meaning":"a metric unit of length equal to 1,000 metres","children":[{"era":"1790s","word":"kilo-","meaning":"one thousand","children":[],"language":"French"},{"era":"1790s","word":"mètre","meaning":"measure","children":[{"era":"classical","word":"μέτρον (metron)","meaning":"measure","children":[],"language":"Greek"}],"language":"French"}],"language":"French"}],"language":"Modern English"}