{"era":"current","word":"classroom","meaning":"A room in which a class of students is taught.","children":[{"era":"current","word":"class","meaning":"a group of students","children":[{"era":"null","word":"classe","meaning":"class","children":[{"era":"classical","word":"classis","meaning":"a division, group, fleet","children":[{"era":"null","word":"*klā-","meaning":"to call, shout","children":[],"language":"Proto-Indo-European"}],"language":"Latin"}],"language":"Old French"}],"language":"Modern English"},{"era":"current","word":"room","meaning":"a space within a building","children":[{"era":"pre-1100","word":"rūm","meaning":"space, area","children":[{"era":"null","word":"*h₁reh₁-","meaning":"open space","children":[],"language":"Proto-Indo-European"}],"language":"Old English"}],"language":"Modern English"}],"language":"Modern English"}