The best replacement for constant acceleration is constant velocity.

The best alternatives to constant acceleration are rated as following:

★★★★★	constant velocity
★★	velocity
★	constant speed
★	average acceleration
	uniform acceleration

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Speaking about constant acceleration, one probably shouldn't forget about distance.

Other search terms related to constant acceleration and their ratings are:

★★★★★	distance
★★★★	velocity
★	constant velocity

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Google Trends

Scale is based on the average worldwide traffic of constant acceleration in all years. Click on graph for more.

constant acceleration

constant velocity

velocity