vt.

1. 承认[（+as）][+v-ing][+that][O2][O7][O8]
   I acknowledge that her criticism is just.

   我承认她的批评是公正的。

2. 就……表示谢忱
   The candidate waved his hands to acknowledge the cheers of the crowd.

   候选人挥手对大众的欢呼表示感谢。

3. 告知收到（信件等）
   I acknowledged her letter at once.

   我马上告知收到了她的信。

4. 对……打招呼
   Stella didn't even acknowledge me when I waved a greeting.

   我向斯特拉挥手致意，可她连招呼也不打一个。

v.

1. accept or admit the existence or truth of.
2. confirm receipt of or gratitude for.
3. greet with words or gestures.