This is the 7206th most frequent Japanese word.
三昧
"三昧" (zanmai) refers to a state of complete absorption or indulgence in something, often associated with concentration or bliss.
三昧 is utilized to emphasize the dominant activity in one's lifestyle, which is meditation in this case.
彼は瞑想三昧の生活を送っています。
He lives a life centered around meditation.
Here, 三昧 is employed to denote a pleasurable focus or immersion in the activity of enjoying hot springs.
温泉三昧を楽しみました。
I enjoyed an indulgent time at the hot springs.
The term 三昧 is used here to describe the indulgence and focus on reading as the main activity of the day.