[fleshweasel]

Idempotency is a good example of a trivia term that would be unreasonable to expect most recent CS graduates to know. Not to say that it's not a valuable property for a service or library or whatever to have under certain circumstances-- but it's not a reasonable way to decide whether a candidate for a junior position is a good fit.

[pbhjpbhj]

Huh, I did a diploma in computing (UK) in my spare time about 12-16 years ago and remember covering it in a databases module (and possibly when doing OOP with Smalltalk?) - I'd go with "it's about repeatability, knowing that sending the same request, eg SQL query, will return the same results".

That's a little off the mark, as I've checked, but I'd think a full-time CS (as opposed to programming or computing or IT) student would be able to define it very readily ...?