the distance between the most outward tips of the wings when they are as extended as possible.

1895–1900; wing + spread Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
wingspan or wingspread (ˈwɪŋˌspæn, ˈwɪŋˌsprɛd)
the distance between the wing tips of an aircraft, bird, etc
wingspread or wingspread

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Adults have a wingspread of an inch or so and are buff to brown in color.
The moths, active mostly at night, are brownish gray and the males have a wingspread of about an inch.
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