Using the OED to trace the development of this word

Using the OED to trace the development of this word

The word picked for me is “radical”, please use the OED as I provided in the file as the citation(no other version of the OED please, it’s required to use this version in my school library), no other sources, please. Quote exactly, find something the most interesting of “Radical” to write about, don’t need to mention everything. And follow the instruction i uploaded, please.