Ã©galitÃ© is a French word, and 'deuce' isn't.
Advantage in if the server wins the point and advantage out if the returner wins the point.
The typical sport that uses the term, "deuce", is Tennis or Table Tennis.
In tennis, when both opponents are tied at 40-40, the score is called deuce. Deuce changes to advantage when one opponent scores after achieving deuce.
Deuce is where both players are on 40 in a match of tennis
The word comes from the French phrase deux, which means "at two" (as in needing two more points to win). Also, there is a Latin prefix in it (du) which mean two; twice.
Deuce in tennis means is 40 all :) as in 15 love, 30 love, 40, love and then if its 40 all peopel just call it deuce