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“ageotropic”
ageotropic (adjective) (not comparable)
Not reacting to gravity, thus moving or turning away from the earth: Some kinds of ivy are ageotropic in that the plants secure their roots in the trucks of trees while growing upwards into the branches.
Maybe a hot-air balloon is considered to be ageotropic because the aircraft is lighter than air and rises up into the atmosphere and is carried by or progresses with the wind.