A voting procedure in which voters may vote for (approve of) as many of the alternatives as they wish.
An election decision method where the winner is the candidate who gets the largest number of votes based on a ballot where each voter votes for as many of the candidates running as he/she is willing to have serve in the office (i.e. each voter votes for the candidates who have the voters approval).
In approval voting, you may vote for as many choices as you like, but you do not rank them. You mark all those of which you approve. Approval voting violates Arrow's criteria less than any other known method. [refcomap, p.29