1
a
: winding around a center or pole and gradually receding from or approaching it
the spiral curve of a watch spring
b
: helical
c
: spiral-bound
a spiral notebook
2
: of or relating to the advancement to higher levels through a series of cyclical movements
1
a
: the path of a point in a plane moving around a central point while continuously receding from or approaching it
b
: a three-dimensional curve (such as a helix) with one or more turns about an axis
2
: a single turn or coil in a spiral object
3
: something having a spiral form as:
a
b(1)
: a spiral flight
(2)
: a kick or pass in which a football rotates on its long axis while moving through the air
4
: a continuously spreading and accelerating increase or decrease
wage spirals
spiraled or spiralled; spiraling or spiralling
: to go and especially to rise or fall in a spiral course
costs spiraled upward
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Merriam-Webster unabridged
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