Over the years I've redefined meditation a million times to come up with a line that includes all of the eastern meditations that I am aware of. So here is the definition "Continuous uninterrupted use/application of consciousness/awareness". When I started meditating I was sort of competing with my ability to stay still and silent.(not just physically but mentally). Nowdays I rarely use the word meditation. I feel the word is over polluted. I call it practicing concentration n dilution of awareness. I dont think of meditation as an activity but as a state of observance regardless of what activity you do. The simpler meditations are based on inactivity. Sitting with eyes closed. But it can get as complex as you want.