Final answer:
In golf, an 'ace' refers to a hole-in-one, meaning the ball is hit from the tee into the hole with a single stroke. It's a renowned achievement in the sport.
Step-by-step explanation:
An ace in golf specifically refers to scoring a hole-in-one, which means hitting the ball directly from the tee into the hole with just one stroke. This is a rare and celebrated feat in the sport of golf. The term 'ace' is not to be confused with other terms such as handicap, which refers to a system used to level the playing field among golfers of different skill levels. 'Ace' in golf signifies exceptional skill or luck and is a goal many golfers aspire to achieve in their playing careers.