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Source: Economics: Principles & Practices Definition: change in investment spending caused by a change in overall spending (p. 448)

or acceleration principle - changes in the demand for consumer goods cause even greater changes in the demand for capital goods.

the effect on GDP of the increase in investment that results from an increase in output. For instance, the greater output leads a firm to believe that the demand for its products will rise in the future; the resulting increase in investment leads to growth in output and still further increases in investment, accelerating the expansion of the economy

The causal relationship between changes in consumption and changes in investment.

Is an economic theory that suggest that the level of net investment will be determined by the rate of change of national income.If national income is falling then net investment will fall.

In macroeconomic theory, the accelerator (also: accelerator coefficient) refers to the amount of investment induced by a change in output. Investment and output are linked by the accelerator and the multiplier together these effects are thought to produce a cyclical pattern of economic growth.