Perhaps this is common knowledge, but I’ll put it out there anyway… since I seem to have turned into Dr. Pragmatic.

Did you ever read something and not understand one of the words?

Just use Google to define it (better/faster than Wikipedia, Dictionary.com, etc. — IMO)

Either in a Google Toolbar or at Google.com

Type: “define: then type or paste your word”
Click enter.

e.g. define:plebiscite:

How to define a word in Google

Great time saver.

;^ )
Cheers!