aboard

Etymology

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

adv

1. On board; into or within a ship or boat; hence, into or within a railway car.
   We all climbed aboard.
   As the 1857 to Manchester Piccadilly rolls in, I scan the windows and realise there are plenty of spare seats, so I hop aboard. The train is a '221'+'220' combo to allow for social distancing - a luxury on an XC train as normally you're playing sardines, so I make the most of it. December 2 2020, Paul Bigland, “My weirdest and wackiest Rover yet”, in Rail, page 68
2. On or onto a horse, a camel, etc.
   To sling a saddle aboard.
3. (baseball) On base.
   He doubled with two men aboard, scoring them both.
4. Into a team, group, or company.
   The office manager welcomed him aboard.
5. (nautical) Alongside.
   The ships came close aboard to pass messages.
   The captain laid his ship aboard the enemy's ship.

prep

1. On board of; onto or into a ship, boat, train, plane.
   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. 2012-03, William E. Carter, Merri Sue Carter, “The British Longitude Act Reconsidered”, in American Scientist, volume 100, number 2, page 87
   We all went aboard the ship.
2. Onto a horse.
3. (obsolete) Across; athwart; alongside.
   Nor iron bands aboard The Pontic Sea by their huge navy cast. 1591, Edmund Spenser, Virgil's Gnat