Definitions
1.AdjectiveNot in an offside position; In the part of the playing area where one can legally play the ball, puck, etc."The goal was allowed because the attacker was onside."
2.AdjectiveWithin bounds.
3.AdjectiveOn the side of a vehicle from which the driver, paddler, etc. propels it.
4.AdjectiveFavourably located, from the point of view of the player taking a finesse.
5.AdjectiveIn agreement or support; on board.
6.NounThe portion of the playing area where one can legally play the ball, puck, etc.
7.NounThe side of a vehicle on which the driver primarily propels it.