regards[plural]›COMMUNICATIONSused to send good wishes to someone at the end of a letter or an email, or to ask someone to give greetings to another person who is not present: I look forward to hearing from you. With kind regards, David Price.Please convey my regards to your boss.
in/with regard to sb/sth›in connection with someone or something: I am writing to you with regard to your letter of 15 March.