IPA: /ˌruːmɪˈneɪʃən/
KK: /ruməˈneɪʃən/
The process of thinking carefully and deeply about something, often for a long time.
After much rumination, she decided to change her career path.
Rumination → It is formed from "ruminare" (meaning to chew over) and the suffix "-tion" (indicating the action or process). The word "rumination" refers to the process of thinking carefully and for a long period about something, akin to the way ruminant animals chew their food repeatedly.
Think of the word 'ruminate' which means to think deeply, and remember that 'rumination' is the action of thinking things over carefully.