From Middle English loupe (“noose, loop”), earlier lowp-knot (“loop-knot”), of North Germanic origin, from Old Norse hlaup (“a run”), used in the sense of a "running knot", from hlaupa (“to leap”), ultimately from Proto-Germanic *hlaupaną (“to leap, run”). Compare Swedish löp-knut (“loop-knot”), Danish løb-knude (“a running knot”), Danish løb (“a course”). More at leap. The verb is derived from the noun.
loop (plural loops)
- A length of thread, line or rope that is doubled over to make an opening.
- The opening so formed.
- A shape produced by a curve that bends around and crosses itself.
- Arches, loops, and whorls are patterns found in fingerprints.
- A ring road or beltway.
- An endless strip of tape or film allowing continuous repetition.
- A complete circuit for an electric current.
- (programming) A programmed sequence of instructions that is repeated until or while a particular condition is satisfied.
- (graph theory) An edge that begins and ends on the same vertex.
- (topology) A path that starts and ends at the same point.
- (transport) A bus or rail route, walking route, etc. that starts and ends at the same point.
- (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.
- 2012, Andrew Martin, Underground Overground: A passenger's history of the Tube, Profile Books, →ISBN, page 119:
- In 1908 the line was extended to a station called Wood Lane, which was built on a terminal track loop so that trains could turn round and go back the other way, [...]
- (algebra) A quasigroup with an identity element.
- A loop-shaped intrauterine device.
- An aerobatic maneuver in which an aircraft flies a circular path in a vertical plane.
- A small, narrow opening; a loophole.
- c. 1597 (date written), William Shakespeare, “The First Part of Henry the Fourth, […]”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act IV, scene i]:
- And stop all sight-holes, every loop from whence / The eye of Reason may pry in upon us.
- Alternative form of loup (“mass of iron”)
- (biochemistry) A flexible region in a protein's secondary structure.
- A-B loop
- adjustable loop
- angler's loop
- artillery loop
- autoregulatory loop
- belt loop
- busy loop
- closed loop
- closed time loop
- compulsion loop
- core loop
- crossed loop sensor
- death loop
- do-while loop
- do loop
- fisherman's loop
- foreach loop
- fruit loop
- ground loop
- harness loop
- hearing loop
- hysteresis loop
- induction loop
- keep someone in the loop
- Latham loop
- launch loop
- Lebanese loop
- local loop
- locker loop
- Lofstrom loop
- loop de loop
- loop diuretic
- loop hole
- loop invariant
- loop jump
- loop line, loopline
- loop of Henle
- loop pedal
- loop quantum gravity
- loop ratio
- loop transfer function
- Möbius loop
- Moufang loop
- phase-locked loop
- service loop
- small loop
- strange loop
- throw for a loop
- time loop
- toe loop
- ulnar loop
- Wilson loop
- The translations below need to be checked and inserted above into the appropriate translation tables. See instructions at Wiktionary:Entry layout § Translations.
loop (third-person singular simple present loops, present participle looping, simple past and past participle looped)
- (transitive) To form something into a loop.
- (transitive) To fasten or encircle something with a loop.
- (transitive) To fly an aircraft in a loop.
- (transitive) To move something in a loop.
- (transitive) To join electrical components to complete a circuit.
- (transitive) To duplicate the route of a pipeline.
- (transitive) To create an error in a computer program so that it runs in an endless loop and the computer freezes up.
- (intransitive) To form a loop.
- (intransitive) To move in a loop.
- The program loops until the user presses a key.
- 2011 February 4, Gareth Roberts, “Wales 19-26 England”, in BBC:
- The outstanding Tom Palmer won a line-out and then charged into the heart of the Welsh defence, scrum-half Ben Youngs moved the ball swiftly right and Cueto's looping pass saw Ashton benefit from a huge overlap to again run in untouched.
- To place in a loop.
- 2021 January 13, Richard Clinnick, “Longer freight trains boost efficiency and reduce carbon”, in Rail, page 10:
- It found that trains often looped on their journey emit 14% to 20% more NOx and particulates than non-stop services.
From Dutch lopen, from Middle Dutch lôpen, from Old Dutch lōpan, from Proto-West Germanic *hlaupan, from Proto-Germanic *hlaupaną (“to run”).
loop (present loop, present participle lopende, past participle geloop)
- (intransitive) to walk
- loep (Western Cape)
From Dutch loop, from Middle Dutch lôop, from Old Dutch *lōp.
loop (plural lope, diminutive lopie)
- walking, gait
- (of events) course
- (of guns) barrel
- (informal) business end (of a rifle, etc.)
- (music, usually in diminutive) run: a rapid passage in music, especially along a scale
- (Hong Kong Cantonese) to repeatedly consume or play songs and videos
- (Hong Kong Cantonese) to repeatedly occur
- (Hong Kong Cantonese) loop; cycle (Classifier: 個／个)
From Middle Dutch lôop, from Old Dutch *lōp.
loop m (plural lopen, diminutive loopje n)
See the etymology of the corresponding lemma form.
Unadapted borrowing from English loop.
loop m (plural loops)
- (computing) loop (repeating sequence of instructions)
- loop (aircraft manoeuvre)
- Synonym: looping
- English terms inherited from Middle English
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