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. A closed circuit. 5. A sequence of instructions that repeats either a specified number of times or until a particular condition prevails. 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. To form into a loop. 9. To fasten, join, or encircle with loops or a loop. 10. To fly (an aircraft) in a loop. 11. To move in a loop or an arc. 12. To join (conductors) so as to complete a circuit. 13. To add or substitute (words) in a film by altering the sound track. 14. To form a loop. 15. Walter Isaacson 16. To make a loop in an aircraft.
