aboard

From Middle English abord, from a- (“on”) + bord (“board, side of a ship”). (Equivalent to a- +‎ board.)

• (UK) IPA^(key): /əˈbɔːd/
• (US) IPA^(key): /əˈbɔɹd/

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Sailors aboard the USS O'Kane.

aboard (not comparable)

1. On board; into or within a ship or boat; hence, into or within a railway car. [First attested from around (1350 to 1470).][1]

   We all climbed aboard.

2. On or onto a horse, a camel, etc. [First attested in the late 19^th century.][1]

   To sling a saddle aboard.

3. (baseball) On base. [First attested in the mid 20^th century.][1]

   He doubled with two men aboard, scoring them both.

4. Into a team, group, or company. [First attested in the mid 20^th century.][1]

   The office manager welcomed him aboard.

5. (nautical) Alongside. [First attested from around (1350 to 1470).][1]

   The ships came close aboard to pass messages.

   The captain laid his ship aboard the enemy's ship.

aboard

1. On board of; onto or into a ship, boat, train, plane. [First attested around 1350 to 1470.][1]
   • 2012 March 1, William E. Carter, Merri Sue Carter, “The British Longitude Act Reconsidered”, in American Scientist‎, volume 100, number 2, page 87:

     Conditions were horrendous aboard most British naval vessels at the time. Scurvy and other diseases ran rampant, killing more seamen each year than all other causes combined, including combat.

   We all went aboard the ship.

2. Onto a horse. [First attested in the mid 20^th century.][1]
3. (obsolete) Across; athwart; alongside. [Attested from the early 16^th century until the late 17^th century.][1]
   • 1591, Edmund Spenser, Virgil's Gnat:

     Nor iron bands aboard The Pontic Sea by their huge navy cast.

• Baroda, aborad, abroad