Ex-date is a financial term that refers to the date that determines whether or not a buyer of a security is entitled to receive a dividend or distribution payment. There are a few other synonyms for the word ex-date in finance, including the "ex-dividend date," the "ex-distribution date," or the "ex-entitlement date." In essence, all these terms are referring to the same thing: the date that determines whether or not an investor can receive a financial payout. It's important for investors to keep track of ex-dates in their portfolio, as it can impact their overall returns and help them make informed financial decisions.