Definition of "forty" []

• The cardinal number equal to 4 × 10. (noun)
• A decade or the numbers from 40 to 49: They stopped smoking in their forties. At night the temperature fell into the forties. (noun)
• The decade from 40 to 49 in a century. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• ""Mr. Brewer of the Crown inn, Nothingham, undertook for a wager of forty guineas to go with a mare belonging to him in a cart, to Newark and back again, being a distance of _forty miles, in four hours_."
• "Early Park, in the parish of B Bird, had been his residence since he first came to the title forty years ago, and had been the scene of all his labours."
• "Early Park, in the parish of Bird, had been his residence since he first came to the title forty years ago, and had been the scene of all his labours."