- The act of thinking about something in a sustained fashion.
- The act or process of chewing cud.
- The act of ruminating; i.e. chewing cud and other ruminants.
- (figuratively) Deep thought or consideration.
- (psychology) Negative cyclic thinking; persistent and recurrent worrying or brooding.
- (pathology) An eating disorder characterized by repetitive regurgitation of small amounts of food from the stomach.