Catholic Dictionary
Find accurate definitions of over 5,000 Catholic terms and phrases (including abbreviations). Based on Fr. John Hardon's Modern Catholic Dictionary, © Eternal Life. Used with permission.
Browsing by the letter 'O'
- O
- O ANTIPHONS
- O SALUTARIS HOSTIA
- O.R.
- O.S.
- O.T.
- OATH
- OATH AGAINST MODERNISM
- OB
- OBADIAH
- OBED
- OBEDIENCE
- OBEDIENTIAL POTENCY
- OBEDIENTIARIES
- OBEDIENTIARY
- OBELISK, VATICAN
- OBERAMMERGAU
- OBEX
- OBJECT
- OBJECTIVE
- OBJECTIVE END
- OBJECTIVE GUILT
- OBJECTIVE HOLINESS
- OBJECTIVE MORALITY
- OBJECTIVITY
- OBLATE, LAY
- OBLATES
- OBLATIONS
- OBLIGATION
- OBLIGATION, CLERICAL
- OBLIGATORY SIGN
- OBREPTION
- OBSCENITY
- OBSCURANTISM
- OBSERVANCE
- OBSERVANTINES
- OBSESSION
- OBSESSION DIABOLICAL
- OBSTINACY
- OCCAMISM
- OCCAM'S RAZOR
- OCCASION
- OCCASION OF SIN
- OCCASIONALISM
- OCCULT
- OCCULTISM
- OCCUPANCY
- OCTAVES
- ODIUM THEOLOGICUM
- ODOR OF SANCTITY
- OFF.
- OFFERING COMMUNION
- OFFERTORY
- OFFICE OF READINGS
- OFFICE, DIVINE
- OFFICE, ECCLESIASTICAL
- OFFICE, LOSS OF
- OFFICIAL SECRET
- OIL OF CATECHUMENS
- OIL OF SAINTS
- OIL OF THE SICK
- OIL STOCK
- OLD AGE
- OLD CATHOLICS
- OLD LAW
- OLD TESTAMENT
- OLEA SANCTA
- OLEUM CATECHUMENORUM
- OLEUM INFIRMORUM
- OLIVE BRANCH
- OLIVETANS
- OMEGA
- OMEN
- OMISSION
- OMN.
- OMNIPOTENCE
- OMNIPRESENCE
- OMNISCIENCE
- OMOPHORION
- OMRI
- ONAN
- ONANISM
- ONE
- ONESIMUS
- ONTOGENESIS
- ONTOLOGISM
- ONTOLOGY
- OPEN PLACEMENT
- OPERATING GRACE
- OPERATIVE HABIT
- OPINION
- OPPORTUNITY
- OPPRESSION OF THE POOR
- OPTATAM TOTIUS
- OPTIMA INTERPRES LEGUM
- OPTIMISM
- OPTIONAL CELIBACY
- OPTIONAL MEMORIAL
- OPUS DEI
- OPUS DEI
- OR.
- OR. ORAT.
- ORATE FRATRES
- ORATIO IMPERATA
- ORATION
- ORATORIANS
- ORATORIO
- ORATORY
- ORD.
- ORDER
- ORDER OF CHARITY
- ORDER, RELIGIOUS
- ORDERS OF KNIGHTHOOD
- ORDERS, ANGLICAN
- ORDERS, SACRAMENT OF
- ORDINAL
- ORDINARIATE, MILITARY
- ORDINARY
- ORDINARY CARE
- ORDINARY JURISDICTION
- ORDINARY MEANS
- ORDINARY POWER
- ORDINATION
- ORDINEM BAPTISMI
- ORDINIS BAPTISMI ADULTORUM
- ORDO
- ORDO CELEBRANDI MATRIMONIUM
- ORDO SYNODI
- OREMUS
- ORGAN
- ORGANIC ARTICLES
- ORGANIC UNIT
- ORIENTALIUM ECCLESIARUM
- ORIENTATION
- ORIGENISM
- ORIGIN
- ORIGINAL JUSTICE
- ORIGINAL SIN
- OROPA
- ORPHREY
- ORTHODOXY
- ORTHOGENESIS
- ORTHOLOGY
- ORTHOPHONY
- ORTHOPRAXIS
- OSCULATORIUM
- OSEE
- OSSERVATORE ROMANO, L'
- OSSUARY
- OSTENSORIUM
- OSTIARIUS
- OUR FATHER
- OUR LADY
- OUR LADY OF RANSOM SCAPULAR
- OUR LORD
- OVERPOPULATION
- OWNERSHIP
- OX
- OXFORD MOVEMENT
- OXON
