noun
plural -ers
[count] someone or something that leads others: such as
someone who guides other people
someone or something that is ahead of others in a race or competition
a powerful person who controls or influences what other people do :a person who leads a group, organization, country, etc.
a person, group, or organization that is the best or most successful in some activity
a person who leads a musical group
b Brit :concertmaster
Brit :2editorial