Simply, the engergy that you feel within you and around you when you find yourself at peace. The energy that holds the protons, neutrons and electrons in consistant orbit. The energy that keeps the earth in orbit. Also called gravity or magnetism. God is not a person, place or thing. God is pure simplicity. God is so uncomplicated that there are people that make God complicated just so they can grasp the concept. God has nothing to so with organized religion. God is the sound you hear when you listen to your own breathing. God is the energy in yourself that you feel for the first person you think of when you have a power outage. God is the energy within you that you feel towards the person (people) you list as your beneficiary. The intricacy of a snowflake, flower or even your own iris. Or perhaps the pleasance of an unexpected smile. The candle in the window that you know is lit for you. When you feel safe, you are feeling God. No judgments. No fear. No persecution. Unconditional appreciation for your individual life force, no matter how insignificant you think it may be. Everyone defines the word "love" differently, so that is why I have refrained from using that word in this definition.
The movie called "What the *!&# Do We Know?" explains the definition of God better than I ever could.