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firstnighter

or first-night·er

[furst-nahy-ter]
noun
  1. a person who often or usually attends the theater, opera, etc., on opening night.
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Origin of firstnighter

First recorded in 1880–85; first night + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018