1. alien-not contained in or deriving from the essential nature of something; an economic theory alien to the spirit of capitalism; the mysticism so foreign to the French mind and temper; jealousy is foreign to her nature. foreign.
1 the quality of being hot; hotness: in physics, heat is considered a form of energy existing as the result of the random motion of molecules and is the form of energy that is transferred between bodies as a result of their temperature difference.  much hotness; great warmth: stifling heat.
(sÅâ²lÉr). adj. 1. Of, relating to, or proceeding from the sun: solar rays; solar physics. 2. Using or operated by energy derived from the sun: a solar heating system.dj. 1. Of, relating to, or proceeding from the sun: solar rays; solar physics.