\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.]

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