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1: an act of inflating : a state of being inflated: such as
a: DISTENSION
b: a hypothetical extremely brief period of very rapid expansion of the universe immediately following the big bang
c: empty pretentiousness : POMPOSITY
2: a continuing rise in the general price level usually attributed to an increase in the volume of money and credit relative to available goods and services
-webster

noun
Economics. a persistent, substantial rise in the general level of prices related to an increase in the volume of money and resulting in the loss of value of currency (opposed to deflation).
the act of inflating.
the state of being inflated.
-dictionary.com

Even the definitions that conflate inflation with rising prices state that the rise of prices is attributable to an increase in the money supply. What is being inflated? The supply of money. As a result, prices rise.

"Inflation has nothing to do with money supply." Really?