Longman Dictionary English From Longman Business DictionaryCAC 40CAC 40 /ˌkæk ˈfɔːti, ˌsiː eɪ siː--ˈfɔːr-/ nounFINANCE a SHARE INDEX of shares in 40 leading companies on the Paris stockmarketThe CAC 40 index of actively traded French stocks was up 1.62%. ldoceonline.com
