名詞 discretion:

1. freedom to act or judge on one's own
2. knowing how to avoid embarrassment or distress
   同義詞：discreetness, circumspection, prudence
3. refined taste; tact
   同義詞：delicacy
4. the power of making free choices unconstrained by external agencies
   同義詞：free will
5. the trait of judging wisely and objectively
   同義詞：discernment

1. I trust his discretion absolutely.
   我完全相信他的判斷。
2. I won't tell you what time to leave, you're old enough to use your own discretion.
   我不告訴你什么時候離開，你已經長大了，該自己作出決定。
3. The hours of the meetings will be fixed at the monitor's discretion.
   開會時間將由班長自行決定。

dis.cre.tion

n.（名詞）
The quality of being discreet; circumspection.See Synonyms at prudence
謹慎，周詳：有謹慎品質；慎重周到參見 prudence
Ability or power to decide responsibly.
決定能力，決斷力
Freedom to act or judge on one`s own:
行動的自由，判斷的自由：
例句：
All the decisions were left to our discretion.
所有的決定都由我們自行做出

【引伸】
discre.tional
adj.（形容詞）
discre.tionally
adv.（副詞）