<p><strong>Noun:</strong></p><ul><li>a cardinal number, ten times four.</li><li>a symbol for this number, as 40 or XL or XXXX.</li><li>a set of this many persons or things.</li><li>forties, the numbers, years, degrees, or the like, from 40 through 49, as in referring to numbered streets, indicating the years of a lifetime or of a century, or degrees of temperature:<ul><li>His office is in the West Forties.</li><li>Her parents are in their forties.</li><li>The temperature will be in the forties.</li></ul></li></ul><p><strong>Adjective:</strong></p><ul><li>amounting to 40 in number.</li></ul><p><strong>End of Response</strong></p>