Do words matter to you?

Do words matter to you? They do to me. I'm always picking up a new word. Here's one for today: 

met·a·cog·ni·tion ( ˌmedəˌkäɡˈniSH(ə)n )  

it means thinking about thinking. Metacognition; it's what I do... I'm owning it!

Any new words you're picking up and want to pass along?