|a. the warmest season of the year, between spring and autumn, astronomically from the June solstice to the September equinox in the N hemisphere and at the opposite time of year in the S hemisphere|
|b. (as modifier): summer flowers; a summer dress Related: aestival|
|2.||the period of hot weather associated with the summer|
|3.||a time of blossoming, greatest happiness, etc|
|4.||poetic chiefly a year represented by this season: a child of nine summers|
|5.||(intr) to spend the summer (at a place)|
|6.||(tr) to keep or feed (farm animals) during the summer: they summered their cattle on the mountain slopes|
|[Old English sumor; related to Old Frisian sumur, Old Norse sumar, Old High German sumar, Sanskrit samā season]|
|1.||Also called: summer tree a large horizontal beam or girder, esp one that supports floor joists|
|2.||another name for lintel|
|3.||a stone on the top of a column, pier, or wall that supports an arch or lintel|
|[C14: from Anglo-Norman somer, from Old French somier beam, packhorse, from Late Latin sagmārius (equus) pack(horse), from sagma a packsaddle, from Greek]|
warmest season of the year, between spring and autumn. In the Northern Hemisphere, it is usually defined as the period between the summer solstice (year's longest day), June 21 or 22, and the autumnal equinox (day and night equal in length), September 22 or 23; and in the Southern Hemisphere, as the period between December 22 or 23 and March 20 or 21. The temperature contrast between summer and the other seasons exists only in middle and high latitudes; temperatures in the equatorial regions generally vary little from month to month. For physical causes of the seasons, see season.
Learn more about summer with a free trial on Britannica.com.