n A length of thread, line or rope that is doubled over to make an opening.
n The opening so formed.
n A shape produced by a curve that bends around and crosses itself.
n A ring road or beltway.
n An endless strip of tape or film allowing continuous repetition.
n A complete circuit for an electric current.
n (programming) A programmed sequence of instructions that is repeated until or while a particular condition is satisfied.
n (graph theory) An edge that begins and ends on the same vertex.
n (topology) A path that starts and ends at the same point.
n (transport) A bus or rail route, walking route, etc. that starts and ends at the same point.
n (rail transport) A place at a terminus where trains or trams can turn round and go back the other way without having to reverse; a balloon loop, turning loop, or reversing loop.
n (algebra) A quasigroup with an identity element.
n A loop-shaped intrauterine device.
n An aerobatic maneuver in which an aircraft flies a circular path in a vertical plane.
n A small, narrow opening; a loophole.
n (biochemistry) A flexible region in a protein's secondary structure.
v (transitive) To form something into a loop.
v (transitive) To fasten or encircle something with a loop.
v (transitive) To fly an aircraft in a loop.
v (transitive) To move something in a loop.
v (transitive) To join electrical components to complete a circuit.
v (transitive) To duplicate the route of a pipeline.
v (transitive) To create an error in a computer program so that it runs in an endless loop and the computer freezes up.
v (intransitive) To form a loop.
v (intransitive) To move in a loop.
v To place in a loop.
n A surname.
n Alternative form of loup (“mass of iron”) [A mass of iron in a pasty condition gathered into a ball for the tilt hammer or rolls.]
n Acronym of loss of offsite power.