- the warmest season of the year: in the North Temperate Zone, generally regarded as including the months of June, July, and August: in the astronomical year, that period between the summer solstice and the autumnal equinox
- a year as reckoned by this season: a youth of sixteen summers
- any period of growth, development, fulfillment, perfection, etc.
Origin of summerMiddle English sumer from Old English sumor, akin to German sommer from Indo-European base an unverified form sem-, summertime from source Sanskrit sám?, half year, season
- of or typical of summer
- designed for or taking place during summer: summer activities