To board or put passengers onto an airplane.
From prefix 'en-' (to put into) + 'plane' (aircraft). Created in modern English (mid-20th century) as air travel became common, mirroring 'entrain' for trains.
Airlines invented this word to match 'deplane' (getting off), but 'enplane' sounds so formal and technical that most people just say 'board.' It's the kind of word bureaucrats love that regular people never use.
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