The lottery in dreams is interpreted as the symbol of your desire to get things quickly without any effort. You wish to receive goods without any input of yourself. The lottery could also show that you are not careful at some point of your life. If you played the lottery and you lost, beware of your surroundings. If you won the lottery, dont trust this dream completely, because it means the opposite, it means you will fail. The other explanation simply shows your desire to win the lottery in some game.
Read more about dreaming of Lottery in other dream meanings interpretations.