acknowledgement

an admission or recognition made in front of others

a clear and direct admission or recognition

recognition from an authority or organization

an official recognition, often in writing

a public and unconcealed admission or recognition

a short or concise recognition

an unspoken or implied admission or recognition

as a way of showing recognition for something

recognition received from a person or group

to be given a response or recognition (more formal than 'get')

to receive a response or recognition

to move your head down and then up again as a sign of recognition

to serve as an admission or recognition

to be equivalent to an admission or recognition

to move your hand as a sign of recognition

to make a low, rough sound as a sign of recognition