relaxation  
noun uk/ˌriː.lækˈseɪ.ʃən/ us/ˌriː.lækˈseɪ.ʃən/
  (FEELING)         
 B1 [ U ]放松;松弛 
the feeling of being relaxed
  I go fishing for relaxation. 我钓鱼是为了消遣放松。 
  [ C ]消遣;娱乐;休闲活动 
a pleasant activity that makes you become calm and less worried
  Yoga is one of my favourite relaxations. 练瑜伽是我最喜欢的娱乐方式之一。 
 - More examples
- Pat teaches evening classes in yoga and relaxation.
- She teaches relaxation techniques.
- A bath is for me a form of relaxation.
- Massage should produce a state of relaxation.
- I use relaxation tapes before I go to sleep.
  (RULE)      
 [ U ]放宽;放松;削弱 
the act of making rules or the control of something less severe
  I cannot allow any relaxation in/of the rules. 我不能允许任何放宽规定的做法。