1. to admit or accept that something is true or exists
2. to show that you have noticed or received something
3. to express thanks or appreciation for something

Examples

• She acknowledged her mistake and apologized.
• The company acknowledged receiving our complaint.
• He waved to acknowledge the crowd’s cheers.
• The author acknowledged her editor’s help in the preface.
• They refused to acknowledge the new government.
• Please acknowledge receipt of this email.
• The teacher acknowledged the student’s hard work with praise.