Definition of leading light in English:

leading light

Syllabification: lead·ing light
Pronunciation: /ˌlēdiNG ˈlīt
 
/

noun

A person who is prominent or influential in a particular field or organization: Glass is one of the leading lights in modern music
More example sentences
  • He is probably the leading light in the field of Australian improvised music.
  • Everyone would have to admit that Graham proved himself a leading light on the field of play.
  • In the last 15 years Scotland has been a leading light in the field of public art and public sculpture.

Definition of leading light in:

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Word of the day abjure
Pronunciation: əbˈdʒʊə
verb
solemnly renounce (a belief, cause, or claim)