"cosmological constant." YourDictionary, n.d. Web. 16 September 2018. <http://www.yourdictionary.com/cosmological-constant>.
cosmological constant. (n.d.). Retrieved September 16th, 2018, from http://www.yourdictionary.com/cosmological-constant
A constant introduced into the general theory of relativity, proportional to the energy density of the vacuum, and related to the rate of expansion or contraction of the universe. The vacuum energy represented by the cosmological constant is a form of dark energy.