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Webster's Dictionary (1865)

Sol-stĭ'tial, a.

adjective

(sol-stĭsh'al), a. [Lat. solstitialis, It. solstiziale, Sp., Pg., Pr., & Fr. solsticial.]

  1. Of, or pertaining to, a solstice; as, a solstitial point.
  2. Happening at a solstice; especially (with reference to the northern hemisphere), happening at the summer solstice, or midsummer. “Solstitial summer’s heat.” Milton.