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• n  a person who explains

• Citation: "A distinguished contributor to modern physical theory, a forthright expositor of the public implications of science.
• Published in hardcover soon after, the terse account of unnatural disaster established its author as a major expositor of big themes and public enlightenments.
• Inducted into the Army in San Francisco, William Saroyan, the drama's expositor of the throbbing heart.

• expounder

Quotes

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• John Jenkins in ABC News
  Both as a public intellectual and as a diplomat, Mary Ann Glendon has impressively served our Church and our country,said the Rev. John Jenkins, the university president. "She is an articulate and compelling expositor of Catholic social...
• Alan Blinder in CNN International
  Bernanke is very, very different,Blinder said. "He's a clear expositor; he speaks very clearly, he uses good and simple English."