Englishfor English speakers
aircraft
Noun
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An aircraft is a flying vehicle, usually an airplane.
The army wants money to buy various aircraft, including helicopters and jets.
acceleration
Noun
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Acceleration is a change in speed.
As the plane took off, the acceleration pressed her into her seat.
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Acceleration is by how much a speed or velocity goes up.
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derivative for velocity,has formula matha=\lim_{\Delta x \to 0}\frac{\Delta v}{\Delta t}/math .
factor
Noun
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A factor is one of a number of things that causes a result.
The main factor in the success of our program is our excellent teachers.