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Another definition for the word "acceleration" is "the rate of change of velocity per unit of time."
Rate of Change
Rate of Change
Rate is another word for speed. It is the speed.
Another five-letter word for 'change' is 'alter.'
Heart Rate
The derivative, if it exists.
Another term for heart rate is PULSE
Rate of change is often used when speaking about momentum, and it can generally be expressed as a ratio between a change in one variable relative to a corresponding change in another. Graphically, the rate of change is represented by the slope of a line.
Linear[ity]
rate
If an entiry is dependent on another entity in a certain way then the change in value of the dependent entity to an unit change in the value of the independent entity is the rate of change.