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1. Carried or used aboard a vehicle or vessel: onboard radar systems.
2. Participating in or supporting an effort: I contacted my sisters to make sure they were onboard before I booked the beach house for our vacation.
1. Onto a vehicle or vessel: "His 'semi-fiancée' came onboard at Cape Town" (Dale Peterson).
2. Into a state of participation of support for an effort: "If you were running one of the organization's programs or schools, you did everything you could to get the parents onboard" (Paul Tough).
Aboard: "the long hours onboard an aircraft on the way to some diplomatic engagement abroad" (Molly Worthen).
tr.v. on·board·ed, on·board·ing, on·boards
To introduce to a system or process: a human resources administrator who onboards new hires.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
the induction and assimilation of a new employee into a company or organizationthe management of the early stages of a relationship between a business and a customer
[C21: from the phrase to get someone on board]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014