If you’re wondering about the legality of not paying taxes on your lottery winnings, then you’re wondering if it’s legal not to pay the taxes.
The noun legality traces back to the Latin word legalis, meaning law, and it used to indicate the degree to which something agrees with the law. If you question the legality of something, such as a wiretap, what you’re doing is questioning whether or not it’s legal in a court of law. You might hear someone say that a court validated the legality of a particular action. That means the court ruled that the action was legal.