midsummer /mɪdˈsʌmə(ɹ)/noun 5adjective 1forms 1 noun5 •The period around the summer solstice; around June 21st in the northern hemisphere. •The middle of summer. •Midsummer Day, the English quarter day. •A pagan holiday or Wiccan Sabbat. •The first day of summer. adjective1 •Of or occurring in the middle of summer. formsmidsummers