Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Origin: Perhaps from Scottish Gaelic lub 'loop, bend'

loop

1 noun
     
loop1 [countable]
1

shape or line

a shape like a curve or a circle made by a line curving back towards itself, or a piece of wire, string etc that has this shape
loop of wire/rope/string etc
A loop of wire held the gate shut.
belt loop (=a loop of material for holding a belt on trousers etc)
2TD

computer

TD a set of operations in a computer program that are continuously repeated
3

film/music

AMTTCR a film or music loop contains images or sounds that are continuously repeated
4

be in the loop/be out of the loop

informalPGO to be or not be part of a group of people who make important decisions
5

knock/throw somebody for a loop

American English informal to surprise and upset someone
6

road/railway

British EnglishTTT a road or railway line that leaves the main road or track and then joins it again further on

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