Which definition describes areas not on the course?

The definition that describes areas not on the course is "Out of Bounds." This term refers to any part of the golf course that is outside the designated playing area, which can include areas beyond the boundaries marked by fences, walls, or natural features such as a road or a body of water. When a ball is deemed out of bounds, it means that the player must take a penalty stroke and then re-hit from the original spot, which adds to the challenge of the game.

Understanding the concept of out of bounds is critical for players, as it sets the parameters for where play is considered valid. The knowledge of these boundaries helps golfers navigate the course effectively and understand the rules of play in relation to scoring and penalties. It's a fundamental aspect of golf that influences strategy and decision-making during a round.