The instructions on how to use the dictionary are what say this, not me.
You are wrong.
God means The Supreme or Ultimate Reality.
Could you say that God is "the Being perfect in power, wisdom, and goodness who is worshipped as creator and ruler of the universe"? Certainly, you could, many do understand God in this way and worship God as such.
Could you say that God is "the incorporeal divine Principle ruling over all as eternalSpirit : infinite Mind"? This is certainly what the church that was formed from the teachings of Mary Baker Eddy teaches.
You don't have to agree with any of these examples to believe God, indeed there are millions of people who don't. The essential definition is "the supreme or ultimate reality".
And I would say, The Supreme and Ultimate Reality, for they really are one and the same.