darkes said

Yes, you are technically correct that that is the dictionary definition of a democracy.
However, if you asked any person who is a citizen of a democratic state, they would assume it meant that the majority vote wins.
To take an example, if the French parliament votes on something, with a result of say 500-50, would you expect the side that got 500 votes or the one that got 50 to win ??

You are totally incorrect in stating that ALL the members vote on security council issues - as you said only 15 (out of all the members) get the chance, and 5 of those can veto a vote, making it completely meaningless anyway.
Well, first the second point . When I say ALL the member I'm refering to the 15 not all the countries (look at the list, I don't know why some are in UN).

For the first point, if you look at how a US president is elected and how a French president is elected you'll find some differents but both are democratic. There is rules and you must follow them. In our both countries the majority wins but there is several majority too : absolute and relative. Why one will be better than the other ? I don't see the permanent members with a veto but I see that all the permanent members MUST BE ALL AGREE. The result is the same but the thinking is different.