Math Words That Start With W, X, Y, or Z (53 Terms + Definitions)

This page lists every math word that starts with W, X, Y, or Z in the Mathwords dictionary (20 with W, 8 with X, 6 with Y, 18 with Z). The full lists are below; the most looked-up terms are at the end of the page.

Most Looked-Up W, X, Y, and Z Terms

Wallis Formula — The Wallis Formula expresses π/2 as an infinite product of rational factors.
Washer — The flat, ring-shaped region between two concentric circles that have different radii.
Washer Method — A technique for finding the volume of a solid of revolution when the region being rotated does not touch the axis of rotation, creating a…
Wavelength — The distance along the horizontal axis that one complete cycle of a wave or sinusoidal function spans.

x-bar — X-bar (written $\bar{x}$) is the symbol used in statistics to represent the mean of a sample — the average value calculated from a subset…
x-Coordinate — The first number in an ordered pair that tells you how far left or right a point is from the origin on a coordinate plane.
x-intercept — A point where a graph crosses or touches the x-axis, meaning the y-coordinate at that point is zero.
x-y Plane — The flat, two-dimensional surface formed by the horizontal x-axis and the vertical y-axis, where every point has a z-coordinate of zero.

y-Coordinate — The second number in an ordered pair $(x, y)$, telling you how far up or down a point sits from the x-axis on a coordinate plane.
y-hat — Y-hat (written ŷ) is the predicted value of the response variable that you get by plugging an x-value into a regression equation.
y-intercept — The point where a graph crosses the y-axis.
y-z Plane — The flat, two-dimensional surface in three-dimensional space that contains both the y-axis and the z-axis.

Z-Axis — The third axis in a three-dimensional coordinate system, extending perpendicular to both the x-axis and y-axis.
z-intercept — The point where a graph crosses the z-axis in three-dimensional space.
Z-Score — The number of standard deviations a data point is away from the mean of a dataset.
Z-Test — A statistical hypothesis test that determines whether a sample mean differs significantly from a known population mean, using the standard…