acknowledgement
n.a statement that you accept something is true or that you recognize someone's effort. You use it to show you have received a message or to give credit.
n.the act of accepting or admitting the truth or existence of something; a formal expression of thanks or recognition. Typically uncountable when referring to the act of receiving; countable when referring to a specific statement of thanks.
“She gave a quick acknowledgement of his help.”
“The author included an acknowledgement section to thank the researchers who supported the project.”
“His silence served as a tacit acknowledgement of the team's failure to meet the strict deadline.”
“And there is a private acknowledgement that stories like this can be off putting to voters beyond Reform's no doubt very enthusiastic base.”
“It was eight days after receiving acknowledgement from the city of Oceanside for his extraordinary contributions to waveriding worldwide.”