noun
maven
MAY-vun/ˈmeɪvn/
A person with extensive knowledge of a particular field.
The bicycle maven demonstrates a precise derailleur adjustment to the attentive newcomer.

Etymology
The underlying expression means “one who understands.” A maven’s enthusiasm is thus framed as informed appreciation: someone who knows a subject well enough to be a connoisseur.
In context
he would sport um the vintage look 1930s, 1940s. Um and and he wore a hat and he had uh he had some renown as this fashion maven.
More examples
- She is a gardening maven who can identify almost any plant.
- Even seasoned financial mavens disagree about the best investments.
- Ask my brother, the family grammar maven, to check your essay.
Forms
maven · mavens
Similar words
- expert
- More neutral and formal; emphasizes substantial knowledge or skill.
- connoisseur
- Emphasizes refined taste and judgment, especially in art or food.
- specialist
- Emphasizes focused expertise, often gained through professional training.