Artificial intelligent assistant

solstitian

solstitian, a.
  (sɒlˈstɪʃən)
  Also 7 solstician.
  [f. L. sōlstiti-um + -an.]
  Solstitial.

1614 J. Taylor (Water P.) Nipping Abuses E 2 b, Sol..High mounted in his chiefe solstician pride. 1845 Theologian II. 37 Capricornus..is an earthy,..moveable,..solstitian,..quadrupedal sign.

Oxford English Dictionary

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