• IPA: /luːp/

loop (plural loops)

1. A length of thread, line or rope that is doubled over to make an opening.
2. The opening so formed.
3. A shape produced by a curve that bends around and crosses itself.

   Arches, loops, and whorls are patterns found in fingerprints.

4. A ring road or beltway.
5. An endless strip of tape or film allowing continuous repetition.
6. A complete circuit for an electric current.
7. (programming) A programmed sequence of instructions that is repeated until or while a particular condition is satisfied.
8. (graph theory) An edge that begins and ends on the same vertex.
9. (topology) A path that starts and ends at the same point.
10. (transportation) A bus or rail route, walking route, etc. that starts and ends at the same point.
11. (rail) 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.
12. (algebra) A quasigroup with an identity element.
13. A loop-shaped intrauterine device.
14. An aerobatic maneuver in which an aircraft flies a circular path in a vertical plane.
15. A small, narrow opening; a loophole.
    • c. 1597, William Shakespeare, “The First Part of Henry the Fourth, […]”, in Mr. William Shakespeares Comedies, Histories, & Tragedies: Published According to the True Originall Copies (First Folio), London: Printed by Isaac Iaggard, and Ed[ward] Blount, published 1623, OCLC 606515358 ↗, [Act IV, scene i]:

      And stop all sight-holes, every loop from whence / The eye of Reason may pry in upon us.

16. Alternative form of loup (mass of iron).
17. (biochemistry) A flexible region in a protein's secondary structure.

• French: boucle
• German: Schlaufe
• Portuguese: laço
• Russian: пе́тля́
• Spanish: lazo, lazada, gaza (nautical), recodo

• French: boucle
• German: Schlaufe, Schleife
• Italian: passante
• Portuguese: laço
• Russian: пе́тля́
• Spanish: lazo, recodo, vuelta, círculo

• German: Endlosschleife
• Italian: riccio
• Portuguese: fita
• Russian: пе́тля́
• Spanish: rizo, círculo, bucle infinito, cinta infinita

• French: circuit fermé
• German: Stromkreis, geschlossener Stromkreis
• Italian: anello
• Portuguese: circuito
• Russian: цепь
• Spanish: circuito cerrado

• French: boucle
• German: Schleife
• Portuguese: ciclo, laço, loop
• Russian: цикл
• Spanish: ciclo, bucle

• French: boucle
• German: Schlaufe
• Spanish: lazo

• Spanish: lazo

• French: boucle
• German: Rundweg, Ring, Ringstraße, Gürtel
• Spanish: vuelta, anillo vial, anillo, ronda, ronda, circunvalación

• German: Loop
• Spanish: bucle

• Italian: spirale
• Russian: (внутрима́точная противозача́точная) спира́ль

• French: boucle
• German: Looping
• Italian: cerchio della morte, giro della morte
• Portuguese: looping, loop
• Russian: мёртвая пе́тля́
• Spanish: looping, rizo

loop (loops, present participle looping; past and past participle looped)

1. (transitive) To form something into a loop.
2. (transitive) To fasten or encircle something with a loop.
3. (transitive) To fly an aircraft in a loop.
4. (transitive) To move something in a loop.
5. (transitive) To join electrical components to complete a circuit.
6. (transitive) To duplicate the route of a pipeline.
7. (transitive) To create an error in a computer program so that it runs in an endless loop and the computer freezes up.
8. (intransitive) To form a loop.
9. (intransitive) To move in a loop.

   The program loops until the user presses a key.

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