ace
n. countable B2 Upper Intermediate US //ˈeɪs// UK //ˈeɪs// ace
n. someone who is exceptionally good at a specific activity. You often use this to describe a person who is the best on their team or in their field.
n. a person who excels at a particular sport or other activity. Informal in register; frequently used as a pre-modifying noun in sports journalism.
She is an ace at solving difficult math problems.
The team signed a new pitching ace to help them win the championship this season.
Despite being a newcomer to the firm, he quickly established himself as a legal ace by winning three high-profile cases in his first year.
Usage
Often used as an attributive noun before another noun, such as 'ace pilot' or 'ace reporter'.