Acosmism is a philosophical belief that denies the existence of the universe, claiming that only God exists. This idea has been widely debated throughout history and has given rise to many synonyms and related concepts. One such term is nihilism, which asserts that life is meaningless and lacks any inherent value. Another is solipsism, which posits that only one's own mind can be certain to exist. Others include idealism, which emphasizes the importance of ideas and mind over the material world, and transcendentalism, which focuses on the spiritual and mystical aspects of existence. Despite their differences, each of these concepts explores the nature of reality and consciousness in its own unique way.