Merriam-Webster Collegiate Dictionary - summer

 I. noun  Etymology: Middle English sumer, from Old English sumor; akin to Old High German & Old Norse sumer ~, Sanskrit sama year, season  Date: before 12th century  1. the season between spring and autumn comprising in the northern hemisphere usually the months of June, July, and August or as reckoned astronomically extending from the June solstice to the September equinox  2. the warmer half of the year  3. year a girl of seventeen ~s  4. a period of maturing powers  • ~like adjective  II. adjective  Date: 14th century  1. of, relating to, or suitable for ~ ~ vacation a ~ home  2. sown in the spring and harvested in the same year as sown ~ wheat — compare winter  III. verb  (~ed; ~ing)  Date: 15th century  intransitive verb to pass the ~  transitive verb to keep or carry through the ~; especially to provide (as cattle or sheep) with pasture during the ~