rumination

About 0.25 uses per million words.

Meaning

1. noun The act of ruminating; i.e. chewing cud.
2. noun Deep thought or consideration.
3. noun Negative cyclic thinking; persistent and recurrent worrying or brooding.
4. noun An eating disorder characterized by repetitive regurgitation of small amounts of food from the stomach.

Similar words

reflexion reflection thoughtfulness meditation contemplation musing merycism chew gumchewing grumbling

Often followed by

and on is in about of disorder over or