The 'first past the post' electoral system refers to -
1
a system of proportional representation of weighted voting in a multi-member constituency.
2
single ballot, plural member majority voting system.
3
a system in which the winning candidate has to secure a plurality as well as majority of the votes cast.
4
an electoral system in which the person winning the most votes of the votes cast in a constituency (single ballot, single member) is declared elected.