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HDO
(redirected from holy day of obligation)

   Also found in: Dictionary/thesaurus, Wikipedia 0.01 sec.
AcronymDefinition
HDOHigh Density Overlay (phenolic resin-impregnated plywood used in concrete forms)
HDOHuman Development Organization (Sri Lanka)
HDOHoly Day of Obligation
HDOHearing Designation Order (FCC proceedings)
HDOHeavy Duty Oil
HDOHigh Demand Occupation
HDOHumanitarian Demining Operation
HDOHydrogen Deuterium Oxide
HDOHeadache During Orgasm
HDOHomeland Defense Office
HDOHousing Development Office
HDOHealth Delivery Organization (various organizations)


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Though Ash Wednesday is not a holy day of obligation, we turn out at church in great numbers.
The Roman Catholic Church designated it as a holy day of obligation, where Roman Catholics generally attend mass, because of the efforts of the Franciscan scholar Luke Wadding in the 17th century.
You had to prepare to fast because the next day was Ash Wednesday, a holy day of obligation.
 
 
 
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