I went through a stage where I'd like to open up my dictionary and flip to a random page, close my eyes and place my finger on a page. Whatever word my finger was closest to I'd make an effort to learn it or use it that day when I speak with people. It was a fun way to broaden my vocab.
I have a dictionary app on my mac that I constantly use. When reading, if a word comes up where I either don't know the meaning, or I am unsure if I'm unsure about the meaning, I look it up. I also have a dictionary screen saver. I watch the words and definitions scroll past whenever it's on.
My late and much lamented father used to read a page of the dictionary every day. Mother and dad were both great readers and the three of us are all prolific readers. I love how reading is contagious. My daughter read at four and at seven it was nothing for her to have five books on the go at once. She is now a much loved school teacher and still a voracious bookworm. (and has worn out three Kindles) I love that I can sit here at my computer and look up any word in an instant. Thanks, dad, for teaching us how to learn ಥ_ಥ