When & Where: I found the word obfuscate while reading the same article, and even on the same page (pg 224) as the word tenet. The sentence was, "The dictionary often obfuscates understanding."
Level of Familiarity: I've never seen or heard this word before. It doesn't even look like a real word! I have no idea how to pronounce it either. Based on this sentence, my best guess is that it means 'confuses.' There aren't a lot of context clues here to help me out though.
What it Means: "render obscure, unclear, or unintelligable." (www.dictionary.com)
Reflective Commentary: I find it interesting that this article seems to obfuscate understanding because of all the difficult vocabulary the author is using! I can't see myself using this word because I'm still not really sure how to pronounce it. However, if I come across it again while reading I know I'll remember what it means.