My 1979 OED defines atheist as "One who denies or disbelieves the existence of a God."
This is the sense in which I have always understood the term and I suggest it is how almost everyone - up to my generation, at any rate - has understood the word.
I don't think this is actually true, and I can unpack why.
For starters, the phrasing of that definition is very strange: the capitalization denotes a proper noun, so "a God" would mean "a god with the name or title 'God'." More typical would be "a god" (lowercase) or just "God" with no article.
... so what sense is it intended in? Neither one really works as a definition of "atheist":
- "one who denies or disbelieves in the existence of God." - this includes many theists, since plenty of theists believe in gods not called "God."
- "one who denies or disbelieves in the existence of a god." - this also includes many theists, since plenty of theists reject the gods of competing religions.
The examples of people's responses, that I gave in post 102, cannot be categorised as those of people who deny or disbelieve in the existence of a God. So they are not atheists, in the meaning as given by the OED and as understood by me. But they would not assent to being categorised as theists either.
But who
is an atheist by that definition?
Whenever someone proposes a definition of "atheist" to me, I measure it against two premises:
- anyone who believes in any gods is not an atheist.
- atheists exist.
I think these are widely accepted as true and reflect normal usage of the term "atheist"... but if a proposed definition of "atheist" either implies that some group of theists are atheists or that the qualifications to be an atheist are practically impossible for a human being, I take this as a big red flag that the proposed definition doesn't reflect how the word is actually used.
... which is my response to your 1979 OED definition: it implies that various theists are actually atheists, so it doesn't reflect how the word "atheist" is actually used.
If I had to guess, I'd say that it's probably a relic of an age and culture that didn't give much thought to forms of god-belief other than Abrahamic monotheism.
Edit: and in any case, look up "disbelief" in your 1979 OED. I'm sure it's consistent with the more modern versions and includes lack of belief in the definition of "disbelief."