existence /ɛɡˈzɪs.təns/noun 2forms 1phrases 1 noun2 •the fact that someone or something is real and can be found in the worldIn order to destroy evil, we must first acknowledge its existence. •Empirical reality; the substance of the physical universe. (Dictionary of Philosophy; 1968) formsexistences Phrases with existence bane of someone's existenceSomeone or something that poses a significant problem to someone.