Learner's definition of WINNER
someone or something that wins a contest, prize, etc.
The winners will receive their medals shortly.
the winners and losers of the court case
And the winner is…the blue team!
You are the grand prize winner! [=the person who has won the grand prize]
a very good or successful person or thing
She's a real winner.
That idea's a winner.
the final goal, point, etc., that wins a game
— often used in combination