Source : Webster's Revised Unabridged Dictionary (1913)

Aerostation \A`["e]r*os*ta"tion\, n. [Cf. F. a['e]rostation the
   art of using a["e]rostats.]
   1. A["e]rial navigation; the art of raising and guiding
      balloons in the air.

   2. The science of weighing air; a["e]rostatics. [Obs.]

Aerostation \A`["e]r*o*sta"tion\, n.
   That part of a["e]ronautics that deals with passive balloons.