The guiding line, or outline, by which the form of a fortified work is determined. It is usually the crest line of the parapet in fieldworks, or the top line of the escarp in permanent fortifications.

plural of magistral line

(nautical) A small rope attached to the topgallant or royal yard, used to trip the yard, and in lowering it to the deck; also, a line used in letting go the anchor.

plural of tripping line

plural of fishing line

(telephony) situation when portions of a second call are audible to persons on a telephone connection.

plural of scan line

(Canada) A place where a north–south grid road jogs to correct for the northward convergence of meridians.

plural of correction line

(typography) The height of a line of text.