atheism

n. lack of belief that God or gods exist, disbelief in the existence of God or gods; godlessness

Atheism, as a philosophical view, is the position that either affirms the nonexistence of gods or rejects theism. When defined more broadly, atheism is the absence of belief in deities, alternatively called nontheism. Although atheism is often equated with  irreligion, some religious philosophies, such as secular theology, or some varieties of Theravada Buddhism, lack belief in a personal god.
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Noun
1. the doctrine or belief that there is no God
(synonym) godlessness
(antonym) theism
(hypernym) religious orientation
2. a lack of belief in the existence of God or gods
(hypernym) unbelief, disbelief

(n.)
The disbelief or denial of the existence of a God, or supreme intelligent Being.
  

(n.)
Godlessness.
  

Atheism, Atheists In modern times, those who do not accept the monotheistic Christian God or any god. It formerly signified those who did not believe in the accepted divinity or divinities of the State or populace.
The Roman Empire was entirely tolerant of religious beliefs, but took strong measures with the early Christians because they were, from the legal viewpoint of the conservative Roman magistrate, religious and quasi-political radicals of a dangerous type. They were atheists in that they did not accept the State gods. Later, to the Christians, the pagans in their turn became atheists because though they believed in gods, they did not believe in the orthodox Christian God. Theosophists, Buddhists, Confucianists, etc., have been at various times called atheists because they do not accept monotheism. To strip a deity of personal human attributes is, in the eyes of monotheists, to deny the existence of that deity altogether.