(military) A front, or a boundary between opposing positions. / A site of a conflict, effort, or controversial matter of any kind. / The site of interaction with outsiders, such as customers.

(military) The line from which soldiers fire their weapons at a target; especially the front line of troops in a battle. / (figuratively) A situation in which someone or something is targeted.

plural of radical line

(electronics) One of the horizontal lines that compose a raster scanning pattern, as on a television or computer display. / (computing) A single row of pixels in a raster graphics image.

(aviation) The precise movement of a civil photogrammetric aircraft along a predetermined course at a predetermined altitude during the actual photographic run.

plural of flight line

plural of phone line

plural of line conch

plural of land line

matriline