Viriditas (Latin, literally "greenness," formerly translated as "viridity"[1]) is a word meaning vitality, fecundity, lushness, verdure, or growth.
[4] In a study of Hildegard by historian of medicine Dr. Victoria Sweet, who is also a physician, Dr. Sweet pointed out how Hildegard used the word viriditas in the broader sense of the power of plants to put forth leaves and fruit, as well as in the sense of an analogous intrinsic power of human beings to grow and to heal.
[7] In her works the word viriditas has been translated in various ways, such as freshness, vitality, fertility, fecundity, fruitfulness, verdure, or growth.
The science fiction author Kim Stanley Robinson used it quasi-theologically to mean "the green force of life, expanding into the Universe."
It's a kind of pattern gravity, a holy greening power we call viriditas, and it is the driving force in the cosmos.