What is Average Propensity To Save?

Legal Definition
In economics, the average propensity to save (APS), also known as the savings ratio, is the proportion of income which is saved, usually expressed for household savings as a fraction of total household disposable income. The ratio differs considerably over time and between countries. The savings ratio for an entire economy can be affected by (for example) the proportion of older people (as they have less motivation and capability to save), and the rate of inflation (as expectations of rising prices can encourage people to spend now rather than later).

The complement (1 minus the APS) is the average propensity to consume (APC).
-- Wikipedia
Legal Definition
The amount after tax that is not spent on consumer goods. This varies depending on the income level.