rumination
noun
ru·mi·na·tion
| \ ˌrü-mə-ˈnā-shən
\
\
Medical Definition of rumination
: the act or process of ruminating:
a
: the act or process of regurgitating and chewing again previously swallowed food
b
: obsessive thinking about an idea, situation, or choice especially when it interferes with normal mental functioning
specifically
: a focusing of one's attention on negative or distressing thoughts or feelings that when excessive or prolonged may lead to or exacerbate an episode of depression