From Latin lunaris "of the moon," from luna luna, the Moon. The Romans called the moon goddess Luna, which in Greek is Selene.
In esotericism, the term lunar is generally used in concert with its solar companion, and this duality can have many implications. In Western esotericism and the writings of Samael Aun Weor, the lunar aspect is seen as feminine, cold, and polarized as negative (not "bad," just the opposite polarity of solar, which is positive). In Asian mysticism, the symbolic genders are often reversed, with the lunar current seen as masculine and related to Chandra, the masculine moon god.
Some example uses of the term lunar:
1. In general "lunar" can indicate something that proceeds mechanically, automatically, — like the movements of the Moon, tides, seasons, etc. — according to the fundamental natural laws. While this is perfectly normal, it is inferior to the solar attributes, which are not bound by mechanical movements, but instead have liberty, freedom of movement, etc.
2. In another context, for example within the body, there are lunar and solar currents. Within us, the lunar current is fallen into disgrace and must be restored, while the solar current remains intact.
3. There are solar and lunar religions: a lunar religion faces backwards, looking only at the past, and remains attached to traditions, habits, mechanical rules. A lunar mind is similar.
4. The lunar bodies are the vehicles we receive from nature automatically: the physical body, vital body, and astral-mental body. Since they were made by nature, they must be returned to nature, thus they are not immortal, eternal, thereby illustrating the need to create solar bodies, which transcend the mechanical, lunar laws of nature.