preposition

aboard

aboard

Welcome aboard the ship.

Welcome aboard the ship.

All the passengers were already aboard.

All the passengers were already aboard.

((prep.)) ((a vehicle)) on or into a ship, train, or aircraft Welcome aboard the ship.

((adv.)) on or into a ship, train, or aircraft All the passengers were already aboard.

Synonyms: on board, on; Antonyms: ashore, off

From Middle English 'on board'. The 'a-' is a reduced form of 'on'.

Picture yourself stepping on 'a board' (a plank of wood) to get onto a ship.

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