According to Webster's dictionary viridity is "the quality or state of being vigorous or active." The definition is widely accepted, but it does not entirely capture the richness of the concept. Ultimately, viridity refers to a sense of life and power. It is about feeling unrestrained, imbued with energy and enthusiasm, and motivated to action. In the physical world, viridity is manifest in a plant's ability to photosynthesize vigorously, generating energy to fuel life processes. In humans, viridity is also about a positive state of mind and assurance; it is about being in control and feeling confident and assured.