[grav-i-ton] /ˈgræv ɪˌtɒn/
the theoretical quantum of gravitation, usually assumed to be an elementary particle that is its own antiparticle and that has zero rest mass and charge and a spin of two.
a postulated quantum of gravitational energy, usually considered to be a particle with zero charge and rest mass and a spin of 2 Compare photon
A hypothetical particle postulated in supergravity theory to be the quantum of gravitational interaction, mediating the gravitational force. Like all force carriers, the graviton is a boson. It is presumed to have an indefinitely long lifetime, zero electric charge, a spin of 2, and zero rest mass (thus travelling at the speed of light). The graviton has never been detected. See also supersymmetry. See Table at subatomic particle.
gravitropism (grā-vĭt’rə-pĭz’əm) See geotropism.
[grav-i-tee] /ˈgræv ɪ ti/ noun, plural gravities. 1. the force of attraction by which terrestrial bodies tend to fall toward the center of the earth. 2. heaviness or weight. 3. gravitation in general. 4. . 5. a unit of acceleration equal to the acceleration of gravity. Symbol: g. 6. serious or critical nature: He seemed […]
noun 1. the technique of using the energy of a gravitational field and the orbital velocity of a planet to change the speed and trajectory of a spacecraft.
noun, Electricity. 1. a cell containing two electrolytes that have different specific gravities. noun 1. an electrolytic cell in which the electrodes lie in two different electrolytes, which are separated into two layers by the difference in their relative densities