set‧ter /ˈsetə $ -ər/ noun [countable]

1. a long-haired dog often trained to help hunters find where animals or birds are

2. style-setter/trend-setter/standard-setter etc
someone who does things that other people admire and try to copy:
Liz has always been a fashion-setter.

3. exam-setter/policy-setter etc British English someone who decides or organizes something as part of a job:
Who’s the question-setter for the quiz night?
⇒ set the pattern/tone/trend at set¹(5), ⇒ pacesetter, trendsetter

[TahlilGaran] Dictionary of Contemporary English ▲