Density is more or less the same as Dimension, but sometimes authors (like Lyssa Royal) prefer the term 'densities' to 'dimensions,' because "density denotes a vibrational frequency and not a location, which the term 'dimension' implies. The density structure of this reality is primarily expressed in SEVEN LEVELS, though each level has sub-levels within it. The density scale is a model used to communicate one's perception or orientation in relation to other realities." (PoL)
Awareness as the multidimensional experience, group-matrix identity, (social memory complex). This is the frequency of total oneness or integration and vibrations at this frequency are merged in identity and become a mass-conscious whole. They magnetize those in other frequencies and provide the current for the natural flow toward integration. Once the seventh density beings reach critical mass, they will progress through the Prism of Lyra (from our point of view it will then be a black hole exit point) and reach the next octave where another adventure awaits.
Awareness as the dimension itself. This has often been called the "Christ Consciousness" in that it displays a frequency level equal to that of the Christ or Buddha.
Experiential awareness of "I" as a group identity, not bound by linear time. In this density sentient consciousness begins to awaken to its heritage. This is the density of wisdom. As one awakens the wisdom within, they very often want to share it with those who are still focused in the lower densities. Many from this realm choose to become guides for others. A 5th-density being merges with its family of consciousness ("oversoul" or "higher self", if you will) and begins to remember. This is the first density in which a non-physical orientation is experienced. Note: there is no clear-cut distinction when transitioning from 5th to 7th densities. Because these densities are not physically oriented, there is much blending in these transitions.
Containment of volumetric awareness, superconsciousness, reintegration of group identity without loss of ego identity; as vibration increases, perception of past, present, and future become more fluid along with the ability to interface with multi-dimensional and multi-density realities, negatively oriented consciousness becomes more difficult to maintain. Presently on Earth, 4th density reality is overlapping third. In humanity's case, this can account for the increased desire for unity, peace and unconditional love as opposed to the illusion of separation that characterizes third density. The vibrational rate of one's reality is stepped up, and therefore one may be faced with personal issues in a much more rapid and intense way.
Volumetric awareness, ego, loss of group identity, development of individual identity, ability to remember past and cognize the future while retaining present awareness. This is the density where human beings emerge.
Awareness as a line, biological matter, development of species identity. The consciousness expressed by 2nd density vibration does not possess self-awareness (or ego).
Awareness as a point, physical matter. This frequency level is the most basic. It provides the matter and energy for the creation of atoms and molecules. The basic life forms of mineral and water, for example, are all operating from 1st density. Humans possess this frequency within themselves as well. It makes up the basic genetic codes.
Dimension: Dimension refers to one's location in space/time rather then a person's vibrational frequency (density).
Prism of Lyra: A prism is a transparent body with a triangular base used to polarize or decompose light or energy into its spectrum. The prism of Lyra is the archetypal idea of the entrance of consciousness into this reality. For Earth's galactic family the entrance point exists within the Lyran system. As consciousness / energy emerged, it fragmented into seven density frequencies, much as a prism would fragment light in seven colors.