I'm not gonna look up a dictionary, so I'm gonna have a go.
plebe - comes from the Roman underclass thing. Plebeian is more modernly used to talk about something that is "for the unwashed masses".
ipso facto - used when something logically follows - If Eric is half a bee, then ipso facto Eric is also half not-bee.
moral relativism - kinda hard to define this, but basically it's when you cast your morals within a particular context, then change them to suit a different context. The morals are considered relative to the contexts. It's basically the foundation for "well, that's just how they do it there". This is different from changing ethics to context btw, but that's getting far too much up my academic alley that I'd get grouchy about having to explain it when I'm tired.
perspicacity (I might not even know that one at all lol) - I *think* this means spunk in the non-jizz way. But it probably doesn't.
antediluvian - no idea.
in medias res - ugh, I know this but I get it confused with mens rea and all that. These are a bunch of legal and philosophical words that are titles of different logical arguments (or logical fallacies). I find it's worth printing out a cheat sheet and sticking it next to my work computer.
ad hominem (and all those other legal terms) - this one is a logical fallacy whereby the arguer attacks the person making the statement rather than the statement itself.
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