from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The middle of the summer.
  • noun The summer solstice, on or about June 21 in the Northern Hemisphere.

from The Century Dictionary.

  • noun The middle of summer; the period of the summer solstice, about the 21st of June (astronomically the beginning of summer), because in Great Britain summer is considered as beginning with May; specifically, midsummer day, June 24th. See midsummer day, below.
  • noun Lunacy.

from the GNU version of the Collaborative International Dictionary of English.

  • noun The middle of summer.
  • noun (Bot.) the oxeye daisy.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The period around the summer solstice; about 21st June in the northern hemisphere.
  • noun The first day of summer
  • noun The middle of summer.
  • noun Midsummer Day, the English quarter day.
  • adjective Happening in the middle of summer.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun June 21, when the sun is at its northernmost point


from Wiktionary, Creative Commons Attribution/Share-Alike License

From Middle English, from Old English midsumer, midsumor ("midsummer"), from Proto-Germanic *midjaz (“mid-”), *sumaraz (“summer”), equivalent to mid- +‎ summer. More at mid, summer.


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