Definition of posters:
(n) :
A picture of a celebrity, an event etc., intended to be attached to a wall.
(n) :
An advertisement to be posted on a pole, wall etc. to advertise something.
(n) :
(Internet) One who posts a message.
(n) :
(basketball) A dunk over a defending player.
(n) :
(Australian rules football, informal) A shot that hits a goalpost, scoring one point.
(n) :
(ice hockey, slang) A shot that hits a goalpost instead of passing into the goal.