Crack Definition and 52 Threads

Here's a real-life brainteaser for you! I have a large number of passwords nowadays, many of which I very rarely use so I can't remember them myself. I don't like to use a software password manager, so I keep them all written in a text file on my pc - all encrypted of course. The code I use...

Sohomore = Gk. Soph- (wise) + moros (fool). I don't doubt that this question has been posited in this forum any number of times, and so I apologize if I am being a chore to anyone, but... In response, the sophomore cracks: "Relative to what?" How does the professor answer the sophomore?