Again, this elicits a question: If we are to seriously consider gravity as a repelling force, how might it be meaningfully construed as such? That is to say, how do we apply Newton's Gravitational Alternative, combined with Einstein's General Principle, to correspond with the anthropomorphic Gravitational Experience?
We will return to this question and its answer by way of a brief comparative investigation of what relationship if any exists between Einstein's concept of gravity, derived from the General Theory Of Relativity, and Einstein's concept of the 4th Dimension, which is also, as we shall see, more than coincidentally derived from the General Theory Of Relativity.
A brief review the definition of dimensions as applied to the Three recognized Dimensions of Space, follows. Let it be qualified firstly that, in colloquial language, the term 'dimensions' may be correctly applied to any number of descriptions, such as 'dimensions' of music or thought or color for example. But, in physics there is only one definition for dimensions. Which we will reconsider, immediately after the following statement concerning contemporary academic physics and its representative posturing toward the subject of the (Einstein's) allegedly 'acknowledged' *4th Dimension (*of 'time and motion').
Mathematicians and physicists are of the consensus agreement that, when the definition of the 4th Dimension is applied to Reality-At-Large as Einstein proved it is in fact, then one automatically departs the realm of conscious experience and comprehensibility. This is the reason for example, that in one renowned case the reputedly omniscient, ever-present yet conceptually elusive 4th Dimension was professionally referenced as, 'a mathematical abstraction on anyone's wrist-watch'. This is also the reason the 4th Dimension is a favorite conscript among science fiction writers and metaphysicists.
There is unflappable security in speculations and improvisations of a subject, about which there is no recognized non-mathematical comprehension; no recognized absolutes or authorities (when the allegory expert falsely emerges everywhere, waxing of discovery, while swearing his subject is functionally unfindable).
A haven for befuddled academic refugees. A jingoistic proving ground that endorses (and/or ambivalently disqualifies) everything and/or anything; according to the needs of the sometimes desperately ignorant, pretentious, scientifically name-saked 'authorities' and historical revisionists. Innocent ignorance is exonerated in this consideration.
No discourse on the 4th Dimension, whether it be physics or science fiction, would be complete without directly suggesting that it is 'unimaginable', or, 'incomprehensible', or 'something else', or 'someplace else' ('far out').
Yet, it is agreed that the 4th Dimension is 'time & motion' ; somehow integrally combined with the 3 recognized Dimensions of Space; existing always and everywhere. Therefore we need very little imagination or faith in Einstein, to know that we are perpetually witnessing and experiencing the 4th Dimension, in simply being conscious of the reality we are part of; by which we are constantly surrounded.
We can correctly go one step further. We can be confident that the 4th Dimension has been, and continues to be overlooked. That is, we can know that some very fundamental constituent or phenomenon of reality - with which we are all familiar, but which has yet to be recognized, is the 4th Dimension. The 4-Dimensional space-time continuum to be exact.
Today's physical scientists tell us that 'the 4th Dimension is time and motion'. They say this because they know Einstein proved it mathematically. But it is not a non-mathematically satisfactory answer; because it does not contribute to any further comprehension of what the 4th Dimension is, relative to The colloquial 3-Dimensional Experience.
Time and Motion are measurable and comprehensible in Three Dimensions. Why not in 4? What is it about proven and measured 4-dimensional reality, that has not been recognized? Why has it not been recognized? The Physical Dimensions, 1 thru 4 (Revisited): The mathematical definition for the 4th Dimension is also the geometric definition. In order to consider the geometric definition for the 4th Dimension we will first review the singularly scientific and formal definition for the Three recognized Dimensions of Space. Then we will consider the 4th Dimension's relationship if any, to Einstein's General Principle of Relativity and/or Newton's Gravitational Alternative. (Refer to Drawing 1 Illustrations 1 & 2) 
The (only known; geometric; metrically spatial) definition for physical dimensions, begins with no dimensions whatsoever - specifically a geometric point. We will call it 'point zero ('0'). Any motion of point '0' will inevitably be at right angles from itself, and, any motion, at any speed, for any length of time, generates a One Dimensional Straight Line 'O' - 'A', of arbitrary length. It cannot be a curved line yet, because it has no dimension(s) to curve into. It may become a longer or shorter One Dimensional Straight Line, but it cannot change its dimensional quality until it moves at right angles (90 degrees, perpendicular) from itself (again). Then it generates a Two Dimensional Plane 'A'- 'B'.
When a Two Dimensional Plane ('A'-'B') moves at right angles to itself (yet a third time), it generates a Space and/or Solid 'B'-'C' of Three Dimensions.
(Picture a line-drawn cube; progressively generated from 0 dimensions to 3-Dimensions: by the right angle extrapolation of the geometric point 0, to 0-A, generating a One Dimensional Straight Line <0------->A>.
The Straight Line 0-A then moving at right angles to itself, generating A-B Two Dimensional Plane. The Two Dimensional Plane A-B moving at right angles to itself B-C; generating a Three Dimensional Solid, occupied or occupiable-by 3-dimensional matter).
The rule here is the right angle/perpendicular projection of each dimension from out of the preceding dimension. This is how physical dimensions are generated, hence, this is their singular physical and philological definition.
That leaves us here and now with the conceptual-geometric credentials to contemplate the Three recognizable Dimensions of Space occupied - or occupiable - by matter. A familiar enough concept; by-way of its Universal physical-conditional manifestation in the entire reception of physical-sensory, instrumental and therefore psychological-conceptual human experience (at large).