Home › Words › P › pentamillionairepentamillionairepentamillionaire · noun — A person whose wealth amounts to five million dollars (or other currency unit).Definition from Wiktionary (CC BY-SA 3.0).EtymologyFrom penta- + millionaire.nounA person whose wealth amounts to five million dollars (or other currency unit).Definitions & examples from Wiktionary (CC BY-SA 3.0).