1. emptying or concentration of mind: the emptying of the mind of thoughts, or the concentration of the mind on one thing, in order to aid mental or spiritual development, contemplation, or relaxation
2. pondering of something: the act of thinking about something carefully, calmly, seriously, and for some time, or an instance of such thinking
3. serious study of topic: an extended and serious study of a topic
[15th century. Directly or via French< Latin meditation-< meditari (see meditate)]