In the early 1970s I took a computer science formal models course in which the instructor mentioned what he called "primal words." He said these were words that had two opposed meanings. The example that he used was "cleave", which was also mentioned by Prof. Olsen in episode 93. (At the time, I wondered to our teacher if "awful" might also be primal, since it carries the meaning of inspiring reverential wonder as well as something very bad.) Has anyone else heard this term used in this way? If so, where? Thanks.