What does Dogma mean in the Catholic Church?

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Roman Catholic dogma

And I will give to thee the keys of the kingdom of heaven. And whatsoever thou shalt bind upon earth, it shall be bound also in heaven: and whatsoever thou shalt loose upon earth, it shall be loosed also in heaven. Gospel of Matthew 16,19

In the Roman Catholic Church, a dogma is an article of faith revealed by God, which the magisterium of the Church presents to be believed. The resurrection of Jesus Christ is the basic truth from which salvation and life is derived for Christians. Dogmata regulate the language, how the truth of the resurrection is to be believed and communicated. One dogma is only a small particle of the living Christian faith, from which it derives its meaning.Roman Catholic Dogma is thus: "a truth revealed by God, which the magisterium of the Church declared as binding." The Catechism of the Catholic Church states:

    "The Church's Magisterium exercises the authority it holds from Christ to the fullest extent when it defines dogmas, that is, when it proposes, in a form obliging the Christian people to an irrevocable adherence of faith, truths contained in divine Revelation or also when it proposes, in a definitive way, truths having a necessary connection with these."

The faithful are required to accept with the divine and Catholic faith all which the Church presents either as solemn decision or as general teaching. Yet not all teachings are dogma. The faithful are only required to accept those teachings as dogma, if the Church clearly and specifically identifies them as infallible dogmata.

Not all theological truths are dogmata. The Bible contains many sacred truths, which the faithful recognize and agree with, but which the Church has not defined as dogma. Most Church teachings are not dogma. Cardinal Avery Dulles pointed out that in the 800 pages of the documents of the Second Vatican Council, there is not one new statement for which infallibility is claimed.

 http://en.wikipedia.org/wiki/Roman_Catholic_dogma