ru ‧ mi ‧ nate /ˈruːməneɪt, ˈruːmɪneɪt/ BrE AmE verb [intransitive]
[ Date: 1500-1600 ; Language: Latin ; Origin: past participle of ruminare , from rumen 'throat' ]
1 . formal to think carefully and deeply about something
ruminate on/over
He sat alone, ruminating on the injustice of the world.
2 . technical if animals such as cows ruminate, they bring food back into their mouths from their stomachs and ↑ chew it again
—rumination /ˌruːməˈneɪʃ ə n, ˌruːmɪˈneɪʃ ə n/ noun [uncountable and countable]