Abeam, in maritime terminology, refers to a positional directive signifying that a particular floating or navigational object, or another vessel is located at approximately 90 degrees to the right or left side (starboard or port side) of the boat's keel line, which is the central longitudinal structural basis of the boat. It doesn't imply that the object or vessel is placed on the boat itself. The object or vessel situated 'abeam' would be along the imaginary line that extends perpendicularly sideways from the midpoint of the boat's length, assuming a right angle to the direction of the boat's usual forward movement. In terms of directional orientation on a boat, if the boat's bow (front end) is considered as 0 or 360 degrees, then 'abeam' would mean either at 90 or 270 degrees.

1. While sailing, I noticed a buoy lying abeam of our boat, it was directly at right angle to our boat's keel. 2. We spotted the lighthouse abeam, its beam of light cutting across the water at perfect right angles to our boat's keel. 3. The incoming ship was abeam, moving with astonishing speed at right angles to our boat's keel line. 4. The playful dolphins swam abeam to our boat's keel, showing off their speed and agility. 5. The fishermen's fleet lay abeam of our yacht, spreading widely at right angles to the direction our boat was facing.

Abeam is a nautical term that refers to a direction at right angles to the ship’s keel line. However, interestingly, it doesn't particularly emphasis on something being on the boat. When sailors say something is "abeam", it could be anything from a lighthouse, land, or another vessel that is situated at a 90-degree angle from the centerline. So, whether you're a maritime enthusiast or a seasoned sailor, the term abeam serves as a crucial navigational direction, helping to precisely locate objects in relation to the ship's position. It’s a fun linguistic example of how sailors have mapped their entire world in relation to the boat!