In terminology, existent, as compared to a non-existent, is a thing having reality or existence. [1]
Quotes
The following are related quotes:
“A similar inquiry is made by those who inquire into the ‘number of existents’; for they inquire whether the ultimate constituents of ‘existing things’ are on or many, and if many whether a finite or an infinite plurality. So they are inquiring whether the principle or element is one or many.”— Aristotle (350BC), Physics (§1.2:315-16) [2]
“The law of sufficient reason, applied to actual existents, reduces itself to the assertion of final causes.”— Bertrand Russell (c.1920), volume on Gottfried Leibniz; cited by Arthur Lovejoy (1933) in The Great Chain of Being (pg. 146) [2]