Origin: Latin suffix -ment
Acknowledgement has 3 different meanings across 1 category:
the state or quality of being recognized or acknowledged
"the partners were delighted with the recognition of their work"
"she seems to avoid much in the way of recognition or acknowledgement of feminist work prior to her own"
a statement acknowledging something or someone
"she must have seen him but she gave no sign of acknowledgment"
"the preface contained an acknowledgment of those who had helped her"
Alternative spelling of acknowledgment
"The formal acknowledgement of receipt was sent to all clients."
In plain English: An acknowledgement is when you admit that something happened or show that someone has done something for you.
"She sent me an acknowledgement confirming that she had received my letter."