Inflation, in simple terms, is the rise of the prices of goods and services over time. When a currency’s purchasing power begins to decline, it is called inflation. Each person recognizes a trend that prices of things increase, for instance, a cup of coffee that used to cost just $0.45c in the 1980s, now costs almost $2. The percentage by which this increase in price is measured is called the inflation rate.
Source: https://the-dots.com/users/economics-dictionary-1347367