Definitions for "Step function"
A two-leveled function, equaling one level for one range (region 1) of the independent variable and the other level for the remaining values (region 2) of the independent variable. Check out this link to MathWorld for more information on step functions.
a function whose graph is a staircase-y thing
A function whose graph resembles a staircase.
A signal change in amplitude, from one level to another, which occurs in zero time. Usually refers to a rectangular front waveform, used in testing transient response.
A signal characterized by instantaneous changes between amplitude levels. The term usually refers to a rectangular front waveform used for making tests of transient responses.
a special type of relationship in which one quantity increases in steps in relation to another quantity