n.

1. 承认；（对权威、功绩等的）确认[U]
   I bowed my head in acknowledgement of guilt.

   我低下头来承认过失。

2. 答谢的表示，致谢；谢礼[C][U]
   We are sending you a small sum of money in acknowledgement of your help.

   为感谢你的帮助我们寄上一小笔钱。

3. （对收到来信等的）确认通知；回音[C]
   We have had no acknowledgement of our letter.

   我们没有收到过确认去信已收到的回音。

4. 【律】承认书；公证状

n.

1. the action or fact of acknowledging.
2. (acknowledgements) a statement printed at the beginning of a book expressing the author's gratitude to others.