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EXPOSITION OF THE BLESSED SACRAMENT
The ceremony in which a priest or deacon removes the Sacred Host from the tabernacle and places it on the altar for adoration. In public exposition the Sacred Host is placed in the lunette of the monstrance and elevated so that all adorers can see it. In private expositions the tabernacle door is opened and the ciborium containing consecrated Hosts is brought forward. Any good cause is reason for private adoration. Public exposition of the Blessed Sacrament requires a period of adoration, in private or public with prescribed hymns and prayers, as well as the blessing with the monstrance. Definite days for public adoration of the Blessed Sacrament are no longer specified for the universal Church; now any days may be chosen for good reasons; and for regular exposition permissions are granted by the local ordinary. The ceremony was introduced in the fourteenth century under the influence of the newly established feast of Corpus Christi. Some religious monasteries and convents with special permission have the Sacred Host perpetually exposed for special honor and devotion with someone in attendance night and day.
All items in this dictionary are from Fr. John Hardon's Modern Catholic Dictionary, © Eternal Life. Used with permission.