apology -
an expression of regret at having caused trouble for someone; "he wrote a letter of apology to the hostess"
acknowledgement,
acknowledgment 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"
apology -
a formal written defense of something you believe in strongly
apology -
An expression of remorse or regret for having said or done something that harmed another: an instance of apologizing saying that one is sorry.