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preboard

[pree-bawrd, -bohrd]
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verb (used with object)
  1. to put or allow to go aboard in advance of the usual time or before others: Passengers with disabilities will be preboarded.
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verb (used without object)
  1. to go aboard in advance.
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Origin of preboard

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018