See under (def 7).
[spahy-ruh l] /ˈspaɪ rəl/
Geometry. a plane curve generated by a point moving around a fixed point while constantly receding from or approaching it.
a single circle or ring of a spiral or helical curve or object.
a spiral or helical object, formation, or form.
Aeronautics. a maneuver in which an airplane descends in a helix of small pitch and large radius, with the angle of attack within that of the normal flight range.
Football. a type of kick or pass in which the ball turns on its longer axis as it flies through the air.
Economics. a continuous increase in costs, wages, prices, etc. (inflationary spiral) or a decrease in costs, wages, prices, etc. (deflationary spiral)
running continuously around a fixed point or center while constantly receding from or approaching it; coiling in a single plane:
a spiral curve.
coiling around a fixed line or axis in a constantly changing series of planes; helical.
of or of the nature of a spire or coil.
bound with a ; spiral-bound:
a spiral notebook.
verb (used without object), spiraled, spiraling or (especially British) spiralled, spiralling.
to take a spiral form or course.
to advance or increase steadily; rise:
Costs have been spiraling all year.
Aeronautics. to fly an airplane through a spiral course.
verb (used with object), spiraled, spiraling or (especially British) spiralled, spiralling.
to cause to take a spiral form or course.
the situation in which price and income increases may each induce further rises in the other
(geometry) one of several plane curves formed by a point winding about a fixed point at an ever-increasing distance from it. Polar equation of Archimedes spiral:r = aθ; of logarithmic spiral: log r = aθ; of hyperbolic spiral:rθ = a, (where a is a constant)
another name for helix (sense 1)
something that pursues a winding, usually upward, course or that displays a twisting form or shape
a flight manoeuvre in which an aircraft descends describing a helix of comparatively large radius with the angle of attack within the normal flight range Compare spin (sense 16)
(economics) a continuous upward or downward movement in economic activity or prices, caused by interaction between prices, wages, demand, and production
having the shape of a spiral
verb -rals, -ralling, -ralled (US) -rals, -raling, -raled
to assume or cause to assume a spiral course or shape
(intransitive) to increase or decrease with steady acceleration: wages and prices continue to spiral
1550s, from Middle French spiral, from Medieval Latin spiralis “winding, coiling” (mid-13c.), from Latin spira “coil,” from Greek speira “coil, twist, wreath,” from PIE *sper- “to turn, twist.” Spiral galaxy first attested 1913.
1726 (implied in spiraled), from spiral (n.). Transferred and figurative sense by 1922. Related: Spiraling.
1650s, from spiral (adj.). U.S. football sense is from 1896.
spiral spi·ral (spī’rəl)
Coiling or developing around an axis in a constantly changing series of planes; helical. n.
A structure in the shape of a coil. v. spi·raled or spi·ralled, spi·ral·ing or spi·ral·ling, spi·rals or spi·rals
To take the form or course of a spiral.
noun, Astronomy. 1. a version of the big bang theory in which the universe underwent very rapid growth during the first fraction of a second before it settled down to its current rate of expansion. noun 1. a variation of the cosmological big-bang theory in which the early stage of the evolution of the universe […]
[in-fley-shuh-niz-uh m] /ɪnˈfleɪ ʃəˌnɪz əm/ noun 1. the policy or practice of through expansion of currency or bank deposits. /ɪnˈfleɪʃəˌnɪzəm/ noun 1. the advocacy or policy of inflation through expansion of the supply of money and credit
[in-fley-shuh-nist] /ɪnˈfleɪ ʃə nɪst/ noun 1. an advocate of through expansion of currency or bank deposits.
- Inflation targeting
noun an economic policy in which the central bank of a country estimates and makes public a projected or “target” inflation rate and then attempts to steer actual inflation toward the target through the use of interest rate changes and other monetary tools