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at a sitting

At one time, during one period. For example, The cruise ship could feed about 500 passengers at a sitting, or We read the entire poem at a sitting. Since the word sitting implies just that posture, the term means “during a period when one is seated and engaged in a single continuous activity.”

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.