Marks of the true church in Protestantism or Catholicism? Although this very related question about the marks of the true church in Reformed Theology has already been asked, my question is whether other Protestant traditions or Catholicism have an equivalent set of requirements for what they consider the true church?
In Catholicism, the marks of the Church are that she is


one 
holy 
catholic
apostolic


these words are taken from the second part of the Nicene creed, which is commonly prayed at every Mass and the tenents of which are generally accepted by mainline Protestant denominations.

I think, but have very little basis for this thought, that Protestant reformers used the word Marks to mean something different. And perhaps it means something different coming over to English from Latin as well as German, we just had one word that meant two totally separate things

Catholics use them as adjective to describe their Church, not as adjectives to describe the ideal church because they know that even though the Church is composed of fallen members, she is the ideal and would continue to be the ideal even if she had no members left alive.

more info in the Catechism