Accelination 

Rate of change of speed. Accelination = d(speed)/dt. Scalar quantity of Acceleration.

The ball had an accelination of 4ms^-2

Accelination by Micheal5728 March 25, 2022

Acclimationable

To make shit up.

Try using this in a sentence, you will sound acclimationable.

Acclimationable by DaBoi598105 January 10, 2021

premature acceleration 

When the person behind you in traffic changes lanes and accelerates to pass only to find that there is not enough room and they have to get back in line.

Driver: Did you see that guy try to pass me? He had to slow down and get back in line.
Passenger: Yeah, that was a case of premature acceleration.

premature acceleration by Morgore December 18, 2008

Accelerationism 

A political philosophy that maintains that a country's current government/society is broken beyond repair, and the only way to fix it is to force things to get even worse so as to completely collapse the system under its own weight and remake it.

Often related to "taking the black pill."

Joey believes in accelerationism because he hates the world he lives in so much that he figures utter chaos is better than what's currently ongoing.

Accelerationism by AOmundson September 22, 2020

accucination

When a fact is imagined and applied as proof in an accusation.

A portmanteau of accusation and hallucination.

Person A: I heard that one in ten people have, at one time, eaten some of their own foreskin and you're the tenth person I've met today, so... QED
Person B: Actually, you didn't count yourself
Person A: Curses! My accucination has backfired!

accucination by Ak You Sin Nation July 30, 2009

acceleration 

Defined as the change in velocity over a period of time. Acceleration is a vector quantity and therefore is stated as a quantity with a direction.

a = (v-u)/t (where a, v and u are vectors)

Where (using SI units):
a = acceleration of the body in metres per second per second (ms^-2, or metres per second squared)
v = final velocity of the body in metres per second (ms^-1)
u = initial velocity of the body in metres per second (ms^-1)
t = time period between the initial and final velocity, in seconds (s)

An accelerating body can also be decelerating (ie, negative acceleration) or be at rest. Also, instantaneous acceleration is a bit different.

1) A car that is travelling at 2ms^-1 changes its speed to 6ms^-1 over a period of five seconds, and doesn't change direction. During that five seconds, it had an average acceleration of .8ms^-2 in initial direction.

2) A car travelling forwards at 2ms^-1 is suddenly put into reverse and five seconds later it is travelling 2ms^-2 backwards. It's average acceleration is .8ms^-2 backwards (-.8ms^-2 forwards). Note in this example, the car would have been temporarily at rest just when it changes direction. It is still accelerating (in negative direction, ie backwards, ie decelerating) during this period.

acceleration by White Razor December 24, 2008

Premature Acceleration 

When a automobile begins to accelerate before it is prudent. Most often witnessed at intersections that are controlled by traffic lights when a driver incorrectly assumes that it is his turn to go next.

Driver: Look at that guy raring to go. I'll bet he doesn't know that it's my turn to go next.

<Car in question moves about a foot and then stops abruptly as he realizes his light did not change green>

Passenger: How embarrassing; a classic case of premature acceleration.

Premature Acceleration by Mit Long February 12, 2010