noun
a source of light that is at the forefront or leading position
adjective
being the most important or influential in a particular group or field
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As a leading light in the field of medicine, Dr. Smith has made significant contributions to research and patient care.
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Sarah is seen as a leading light in our group project because she always has great ideas and keeps us on track.
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Jake is the leading light when it comes to fixing cars in our neighborhood.
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The lighthouse served as a leading light for ships navigating through the stormy waters.