1. A length of line, thread, ribbon, or other thin material that is curved or doubled over making an opening.
2. the opening formed by such a doubled line.
3. something having a shape, order, or path of motion that is circular or curved over on itself.
4. electricity A closed circuit.
5. computer science A sequence of instructions that repeats either a specified number of times or until a particular condition is met.
6. A type of loop-shaped intrauterine device.
7. A flight maneuver in which an aircraft flies a circular path in a vertical plane with the lateral axis of the aircraft remaining horizontal.
8. A segment of film or magnetic tape whose ends are joined, making a strip that can be continuously replayed.
9. sports see league1.
10. to form into a loop.
11. to fasten, join, or encircle with loops or a loop.
12. to fly (an aircraft) in a loop.
13. to move in a loop or an arc.
14. electricity to join (conductors) so as to complete a circuit.
15. to add or substitute (words) in a film by altering the sound track.
16. to form a loop.
17. to move in a loop: "the couple looped constantly around the international social circuit” ( Walter Isaacson).
18. to make a loop in an aircraft.
19. in the loop part of a group that is kept up-to-date with information about something: knew about the merger because she's in the loop.
20. knock slang to surprise tremendously; astonish.
21. out of the loop not part of a group that is kept up-to-date with information about something.
22. archaic A loophole through which small arms may be fired.

1. A length of thread, line or rope that is doubled over to make an opening; the opening so formed
2. A shape produced by a curve that bends around and crosses itself.
3. an endless strip of tape or film allowing continuous repetition.
4. A complete circuit for an electric current.
5. A programmed sequence of instructions that is repeated until or while a particular condition is satisfied.
6. an edge that begins and ends on the same vertex.
7. A loop-shaped intrauterine device
8. a maneuver in which an aircraft flies a circular path in a vertical plane
9. to form something into a loop
10. to fasten or encircle something with a loop
11. to fly an aircraft in a loop
12. to move something in a loop
13. to join electrical components to complete a circuit
14. to form a loop
15. to move in a loop

1. A mass of iron in a pasty condition gathered into a ball for the tilt hammer or rolls.
2. A fold or doubling of a thread, cord, rope, etc., through which another thread, cord, etc., can be passed, or which a hook can be hooked into; an eye, as of metal; a staple; a noose; a bight.
3. A small, narrow opening; a loophole.
4. A curve of any kind in the form of a loop.
5. A wire forming part of a main circuit and returning to the point from which it starts.
6. the portion of a vibrating string, air column, etc., between two nodes; -- called also ventral segment.
7. to make a loop of or in; to fasten with a loop or loops; -- often with up

1. to form into a loop or loops: as, to loop a cord.
2. to fasten or secure with a loop or loops: as, to loop up a curtain.
3. to furnish with a loop or loops: as, to loop a cloak.
4. to form a loop.
5. to move, as the larvæ of certain moths, by forming loops.
6. A folding or doubling of a string, lace, cord, chain, etc., or a short piece doubled and secured to something at each end.
7. something resembling a loop, as the bend of a river; a link; a crook.
8. specifically—
9. in crochet, knitting, and similar kinds of fancy work, same as stitch.
10. A hinge of a door.
11. in railroad and telegraph systems, a branch line leaving the main line at any point and joining it again at some other point; a looping line, as a branch wire carried over to a side station and back.
12. in the theory of Riemann's surfaces, a line running from any point to a branchpoint, then around that branch-point in an infinitesimal circle, and back to the original point by the same path.
13. A part of a curve limited by a crunode.
14. the ear of a vessel, as a stoneware jar, when approximately of the form of a half-ring projecting from the side or lip.
15. in gunnery, a small fron ring in the barrel of a gun.
16. the small ring at the tip of a fishing-rod through which the line passes.
17. in anatomy, a looped vessel or fiber; especially, a nerve-loop.
18. in brachiopods, the folding of the brachial appendages.
19. in acoustics, the part of a vibrating musical string (see sonometer), or, as in an organ-pipe, of a column of air, where the amplitude of vibration is at its maximum. see node.
20. in mech., a slotted bar or ring at the side of any piece of machinery, designed to limit or control the movement of another part.
21. A knot or bur, often of great size, occurring on walnut, maple, oak, and some other trees.
22. A small magnifying-glass.
23. A narrow window; any small, narrow aperture; specifically, in medieval fortification, a small aperture for observing the enemy, for the discharge of arrows or ordnance, or to admit light; a loophole.
24. A gap in the paling of a park, made for the convenience of the deer.
25. A removable fence-panel made of parallel wooden bars, generally united by transverse braces or crosspieces, used as a substitute for an ordinary fence-gate.
26. see loupe.
27.
28. in physical, that region, in a standing wave system, for which the amplitude of vibration is a maximum: opposed to node, which is the region of zero amplitude.

1. fasten or join with a loop
2. an intrauterine device in the shape of a loop
3. anything with a round or oval shape (formed by a curve that is closed and does not intersect itself)
4. a flight maneuver; aircraft flies a complete circle in the vertical plane
5. (computer science) a single execution of a set of instructions that are to be repeated
6. the basic pattern of the human fingerprint
7. move in loops
8. fly loops, perform a loop
9. a complete electrical circuit around which current flows or a signal circulates
10. wind around something in coils or loops
11. fastener consisting of a metal ring for lining a small hole to permit the attachment of cords or lines
12. make a loop in
13. the topology of a network whose components are serially connected in such a way that the last component is connected to the first component
14. a computer program that performs a series of instructions repeatedly until some specified condition is satisfied
15. an inner circle of advisors (especially under president Reagan)