# y-axis

## Definitions

### Computing

- noun the vertical axis of a graph

### Electronics

- In a two-dimensional Cartesian coordinate system, the vertical axis, the other being the x-axis. Also, one of the three mutually-perpendicular
__axes__in a three-dimensional Cartesian__coordinate system__, the others being the x- and z-axes. - One of three reference
__axes__in a__quartz crystal__, the others being the x- and z- axes. - In a CRT, the axis representing the
__vertical deflection__of the__electron beam__.