What is the meaning of Abeam?

On the beam; at a right angle to the centerline or keel of a vessel or aircraft; being at a bearing approximately 090 Degrees or 270 Degrees relative.

Alongside or abreast; opposite the center of the side of the ship or aircraft.

Alongside or abreast; opposite the center of the side of the ship or aircraft.

Alongside.

Beaming, shining (especially with reference to a person's face or eyes).

first-person singular present active subjunctive of abeĊ

Source: wiktionary.org