mass attraction vertical

mass attraction vertical

[′mas ə¦trak·shən ‚verd·ə·kəl]
(geophysics)
The vertical which is a function only of the distribution of mass and is unaffected by forces resulting from the motions of the earth.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.