PLAIN-LANGUAGE DEFINITION
Frame rate
Frame rate is the number of video frames displayed per second.
IN PRACTICE
An example
A constant 30 fps clip contains thirty frames for each second of playback.
What this does not tell you
Changing export frame rate does not recreate motion information absent from the source.
Use the term precisely
When you use this term in a brief or report, include the relevant source, scope and assumptions. An example explains the concept; it is not a benchmark or a promise of results.