{"era":"current","word":"immunology","meaning":"The branch of medicine and biology concerned with immunity.","children":[{"era":"1800s","word":"immunology","meaning":"study of immunity","children":[{"era":"1500s","word":"immunity","meaning":"exemption from service","children":[{"era":"classical","word":"immunitas","meaning":"exemption from public service","children":[{"era":"classical","word":"immunis","meaning":"exempt from service","children":[],"language":"Latin"}],"language":"Latin"}],"language":"English"},{"era":"classical","word":"-logia","meaning":"study of","children":[],"language":"Greek"}],"language":"English (coined)"}],"language":"Modern English"}