(idiomatic) A clear-cut, easy to make a decision. / (law) A clearly defined rule or standard, composed of objective factors, which leaves little or no room for varying interpretation.

The distribution of data and other signals via electric power distribution wires

(nautical) A mark on the hull of a merchant ship to show the waterline under specified conditions, indicating the maximum load that the ship may carry.

plural of International Load Line

To behave in a proper and lawful manner; to obey the rules and expectations of society. / Used other than figuratively or idiomatically: see walk, straight, line.

(computing) A user interface in which the user interacts with the computer through lines of text instead of graphical images.

(physics) The jagged line, on a chart showing the number of protons and neutrons of all known isotopes, beyond which neutron-rich nuclei are unstable and emit neutrons.

(ice hockey) A pass across two of the three lines dividing the rink, the center red line and the two blue lines. Under some rules such a pass is illegal.

(idiomatic) At some point in a process or in a series of events; at some unspecified or unknown time; eventually.

A short introduction or comment intended to garner romantic or sexual interest from a stranger.