Immediate and cancel (IAC) - Financial definition Financial acronyms The entire acronym collection of this site is now also available offline with this new app for iPhone and iPad. Tags: market orders order types Synonym: fill-and-kill Concise definition of the term immediate and cancel see fill-or-kill Browse the financial glossary in alpabetical order # A B C D E F G H I J K L M N O P Q R S T U V W X Y Z