Definitions: (1) to act as one; in concert; (2) being in agreement; in harmony; (3) the totality of components; a person who has brought together their complex parts into a systematic whole

• He who experiences the unity of life, sees his own self in all beings, and all beings in his own self, and looks on everything with an impartial eye. — The Bhagavad-Gita, VI,29 (Written~400 BC-400 AD) {Published 1944}
• Even if there is only one possible unified theory, it is just a set of rules and equations. What is it that breathes fire into the equations and makes a universe for them to describe? — Stephen William Hawking (1942–2018) English theoretical physicist