bcc
From Longman Dictionary of Contemporary Englishbccbcc (blind carbon copy) used in an email when you are sending a copy of a message to various people, when you do not give a complete list of all the people you are sending the message toFrom Longman Business Dictionarybccbcc noun [countable]COMPUTING (blind carbon copy) used in an email when sending someone a copy of a message that you have also sent to someone else, so that this person does not know that other people will also receive the message