- (postpositive) at right angles to the length and directly opposite the centre of a vessel or aircraft
WordReference Random House Unabridged Dictionary of American English © 2019
- Nautical, Naval Termsat right angles to the fore-and-aft line:The vessel was sailing with the wind directly abeam.
- Nauticaldirectly abreast the middle of a ship's side.
- a-1 + beam 1830–40