Meaning

noun a sculpture having fixed units (usually constructed of sheet metal) and attached to a fixed support

adjective (chemistry, physics, biology) resistant to change

adjective not able or intended to be moved

originCoined by German-French artist Jean Arp in 1932 from Latin stabilis (“firmly fixed or established”) to describe the stationary works of Alexander Calder as opposed to his better known mobiles.

Etymology from Wiktionary, CC BY-SA 3.0