By whose definition?

Language is defined by usage, not history, and certainly not the dictionary. We don't use it to mean teaching, so it doesn't mean that. It's just a label. Words don't have intrinsic meaning, and they mean whatever the hell we (as a community) decide they mean.

Clearly, the people who are posting on this board find some negative meaning in the word "indoctrination" that distinguishes it from "teaching." A quick perusal of the education thread will make that pretty apparent. And that's why rj started this thread.