PLAIN-LANGUAGE DEFINITION
CPC
CPC is spend divided by the relevant click count.
IN PRACTICE
An example
Spend of 500 and 1000 clicks gives a CPC of 0.50.
What this does not tell you
Specify which click definition is used and keep the reporting period consistent.
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.