What's the difference between a country being a democracy and not?

(This question is anonymous so that the legions who have blocked me can see.) I posted this Take:

https://www.girlsaskguys.com/social-relationships/a71702-the-united-states-is-too-a-democracy

Some people are insisting that the US, a "constitutional federal republic" (true), is not a democracy.

A helpful opinion owner pointed out (with links, respect!) that "The United Kingdom, is a constitutional monarchy... France is a democratic semi-presidential republic... Germany is a federal parliamentary republic... Italy has a Parliamentary Republic type of government... Spain is a parliamentary monarchy."

Every one of those countries, and more, would insist that they are democracies. Their people vote in free and fair elections for people to represent them in government. Opposition leaders are not imprisoned without due process of law. Politicians, journalists, and other dissidents do not fall out of windows any more than the average person.

These, I think, are the defining attributes of a democratic government, not any millennia old definition.

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Bonus points for anyone who can explain how none of the meanings of the word "democracy" apply to the United States of America.

www.merriam-webster.com/dictionary/democracy
www.collinsdictionary.com/.../democracy
https://www.dictionary.com/browse/democracy
dictionary.cambridge.org/.../democracy

Because that's what you'd have to do to "prove" the US is not one.
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Thanks to the admins who restored the question after it was reported for supposedly "spamming or trolling".
What's the difference between a country being a democracy and not?
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