n.

1. 问候，迎接，招呼[C][U]
   She smiled in greeting.

   她微笑着打招呼。

   She welcomed us with a cheerful greeting.

   她兴高采烈地打招呼欢迎我们。

2. （生日等场合的）祝愿词；贺词；问候语[P]
   He sent his greetings to you in the letter.

   他在这封信里向你致以问候。

n.

1. a word or sign of welcome or recognition.
   ▸the action of greeting.
2. (usu. greetings) a formal expression of goodwill.