noun
: the speed at which a body at any point in a central gravitational field must move in order that its orbit be a parabola and which when the gravitational field is due to a spherical mass (as the earth) is equal to the velocity of escape
noun
: the speed at which a body at any point in a central gravitational field must move in order that its orbit be a parabola and which when the gravitational field is due to a spherical mass (as the earth) is equal to the velocity of escape
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012