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.
I think you mean love. Love is 0. 15 is the first point. 30 is the second point. 40 is the third point. After that, the player gets the game unless each player gets to 40-40. Then, this is called deuce and then one of the players has to win both points after that. If not, they play until one of the players wins the two consecutive points after 40-40. (Ad-in if you win the point after 40-40 and then ad-out if you lose the point after 40-40)
In Love at 40 - 1935 was released on: USA: 30 August 1935
No love means zero. it then goes love (zero), 15, 30, 40. and deuce is when it is 40 for both teams.
-(-40) = +40.
Life starts after 40
40 = "cuarenta"
40% = 0.4
Nah...
For the points 40-40 each, the term used in Tennis is 'deuce'.
For 40 bucks you can
The cast of 40 Love - 2009 includes: Nick Amrani as Boy Amanda Stuber as Girl