{"era":"current","word":"mainstream","meaning":"Conventional ideas or activities","children":[{"era":"17th century (literal), 20th century (figurative)","word":"main stream","meaning":"chief current of a river; dominant trend","children":[{"era":"current","word":"main","meaning":"principal, chief","children":[{"era":"pre-1100","word":"mægen","meaning":"strength, power","children":[],"language":"Old English"}],"language":"English"},{"era":"current","word":"stream","meaning":"a small narrow river","children":[{"era":"pre-1100","word":"stream","meaning":"a current of water","children":[],"language":"Old English"}],"language":"English"}],"language":"English (compound)"}],"language":"Modern English"}