Meaning of ABOARD in English

ABOARD

[aboard] adv or adj (14c) 1: alongside

2. a: on, onto, or within a vehicle (as a car or ship) b: in or into a group, association, or organization "her second promotion since coming ~" 3 baseball: on base

[2]aboard prep (15c): on, onto, within "go ~ ship" "~ a plane"

Merriam-Webster English vocab.      Английский словарь Merriam Webster.