n.

1. 禮貌；殷勤，好意[U]
   He wrote back to her out of courtesy.

   他出於禮貌給她寫了一封回信。

2. 謙恭有禮的言辭（或舉動）[C]

n.

1. courteous behaviour.
   ▸a polite speech or action, especially one required by convention.
2. archaic a curtsy.