The Collaborative International Dictionary
Accelerative \Ac*cel"er*a*tive\, a.
Relating to acceleration; adding to velocity; quickening.
--Reid.
Wiktionary
a. Relating to acceleration; adding to velocity; quickening.
WordNet
adj. tending to increase velocity [syn: acceleratory]
Usage examples of "accelerative".
If it was possible to emerge from the field, it could only be done by an immediate switch to tachyonic drive without accelerative buildup .
Her auburn hair was upswept and sprayed firmly into place, as a safeguard against the tousling it might otherwise undergo from accelerative and centrifugal fluctuations while VJO changed orbits.
The coarse adjustment was the powerful thrusters back and front which fixed final velocity by their accelerative and the decelerative force, and the hyperatomics that took care of the space-swallowing Jumps.
The mysterious substitution of a strange element for tungsten or osmium in various laboratories, the tests indicating that its atomic number was that of plutonium but its atomic weight was far too low, the absurd but necessary theory that the stuff was a gift from some parallel universe and--finally--the fact that the new element, stable when it first arrived, rapidly began to undergo radioactive decay in a startlingly accelerative way.