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Meaning of preboard

pre•board

Pronunciation: (prē-bôrd', -bōrd'), [key]
— v.t.
  1. to put or allow to go aboard in advance of the usual time or before others: Handicapped passengers will be preboarded.
—v.i.
  1. to go aboard in advance.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.