say it: uh-BAWRD
aboard is an adverb meaning "on a ship, train, plane or other vehicle". It carries 4 recorded senses.
on a ship, train, plane or other vehicle
on first or second or third base
“Their second homer with Bob Allison aboard”
baseball
part of a group
“Bill's been aboard for three years now”
Definitions, synonyms and semantic relations for aboard come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.