1a shape produced by a curve that bends round and crosses itself:make a loop in the twine
a length of thread, rope, or similar material, doubled or crossing itself, used as a fastening or handle:a loop of rope tied round their wrists
a curved stroke forming part of a letter (e.g. b, p).
(also loop line)British a length of railway track which is connected at either end to the main line and on to which trains can be diverted to allow others to pass.
(also loop road)British a stretch of road that diverges from a main road and joins it again.
(also loop-the-loop) a manoeuvre in which an aircraft describes a vertical circle in the air.
Skating a manoeuvre describing a curve that crosses itself, made on a single edge.
2a structure, series, or process, the end of which is connected to the beginning:a feedback loop
an endless strip of tape or film allowing continuous repetition.
a complete circuit for an electric current.
Computing a programmed sequence of instructions that is repeated until or while a particular condition is satisfied.
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Universal
form (something) into a loop or loops; encircle:she looped her arms around his neck
[no object, with adverbial] follow a course that forms a loop or loops:the canal loops for two miles through the city
put into or execute a loop of tape, film, or computing instructions.
in (or out of) the loop
informal aware (or unaware) of information known to only a privileged few:he complained of being kept out of the loop and threatened to resign
loop the loop
(of an aircraft) describe a vertical circle in the air:Julie will loop the loop next month on her first trip into the skies
throw (or knock) someone for a loop
North American informal surprise or astonish someone:the emotional aspect of it all threw us for a loop
