On board; into or within a ship or boat; hence, into or within a railway car.

Alongside; as, close aboard.

On board of; as, to go aboard a ship.

On, or in, the canoe.

Across; athwart.

on first or second or third base; "Their second homer with Bob Allison aboard"

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Referring to cargo being put, or laden, onto a means of conveyance.

On, or in, a water craft.

(also "dancing, on the dance floor") safely on the green with an approach shot

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part of a group; "Bill's been aboard for three years now"