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Classic usage
Reading level: hard
Estimated CEFR level: C1 — Advanced
Estimated from word frequency; not an official CEFR classification.
From Middle English, from Old French, from Latin mōbilis (“easy to be moved, moveable”), from moveō (“move”). The video-gaming sense was coined by Richard Bartle to describe NPCs or creatures capable of moving "under their own power" in the 1978 video game Multi-User Dungeon. Bartle retracted an earlier claim of his that it was from the kinetic sculpture sense of mobile (for the "unpredictable but limited" motion of the hanging ornaments).
Mobile River
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Classic usage
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