Random prize draw (7)
(Other definitions for lottery that I've seen before include "Sweepstake" , "Random draw of numbers from a drum to raise money" , "Random selection" , "Game of chance drawing numbers" , "Gamble" .)
(Other definitions for lotto that I've seen before include "gamble" , "Game of chance based on numbered balls being drawn at random" , "house" , "Game like bingo" , "Game in which numbers are drawn" .)