antigravity

[an-tee-grav-i-tee, an-tahy-]

Antigravity Propulsion www.ask.com/Antigravity+Propulsion Find Fast Facts, References and More on Ask.com. Get Answers Now!

noun

Physics. the antithesis of gravity; a hypothetical force by which a body of positive mass would repel a body of negative mass.

(not in technical use) a controllable force that can be made to act against the force of gravity.

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adjective

(not in technical use) counteracting the force of gravity: The antigravity drive in this spaceship will enable us to reach Polaris.

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Antigravity is always a great word to know.

So is nuclear radiation. Does it mean:

radiation in the form of elementary particles emitted by an atomic nucleus produced by decay of radioactive substances or by nuclear fission

the time required for one half the atoms of a given amount of a radioactive substance to disintegrate

Origin:
1940–45; anti- + gravity

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