gravitational constant

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The constant relating the force of gravitational attraction between two bodies to the product of their masses and the inverse square of the distance between them in Newton's law of gravitation. It equals 6.67 × 10⁻¹¹ m³kg⁻¹s⁻².

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun physics An empirical physical constant involved in the calculation of the gravitational attraction between objects with mass

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun (physics) the universal constant relating force to mass and distance in Newton's law of gravitation