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Omnipotent, Omnipresent and Omniscient
See under the entry Attributes of God.
Opus Dei
Latin: 'God's work'. A Roman Catholic organisation founded in 1928 by the Spanish priest Josémaría Escrivá. Its aim to to encourage Christian principles in the secular world.
Orthodox
- Correct christian belief, as contrasted with heresy. The opposite of Orthodox is Heterodox.
- The Orthodox Church.