Definition of Abeam

Babylon English Dictionary
on a 90 degree angle to the keel of a ship (Nautical)
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Abeam Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(adv.)
On the beam, that is, on a line which forms a right angle with the ship's keel; opposite to the center of the ship's side.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
hEnglish - advanced version

abeam
\a*beam"\ (&?;), adv. [pref. a- + beam.] (naut.) on the beam, that is, on a line which forms a right angle with the ship's keel; opposite to the center of the ship's side.

WordNet 2.0

Adverb
1. at right angles to the length of a ship or airplane
Abeam Definition from Business & Finance Dictionaries & Glossaries
BTS Transportation Expressions
An aircraft is "abeam" a fix, point, or object when that fix, point, or object is approximately 90 degrees to the right or left of the aircraft track. Abeam indicates a general position rather than a precise point. (FAA4)
By the Bureau of Transportation Statistics.
Abeam Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
The beam of a ship is its width at the widest point. Generally speaking, the wider the beam of a ship (or boat), the more initial stability it has, at expense of reserve stability in the event of a  capsize, where more energy is required to right the vessel from its inverted position. Typical length-to-beam ratios for small sailboats are from 2:1 (dinghies to trailerable sailboats around ) to 5:1 (racing sailboats over ). Large ships have widely varying beam ratios, some as large as 20:1. Rowing shells designed for flatwater racing may have length to beam ratios as high as 30:1 , while a coracle has a ratio of almost 1:1 - it is nearly circular.

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Abeam Definition from Sports Dictionaries & Glossaries
maritime&shipping&trade
At right angles to , or beside, the boat
Nautical Know How Glossary of Boating Terms
At right angles to the keel of the boat, but not on the boat.
Nautical Nomenclature
At right angles to , or beside, the boat