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What does HDO stand for?

HDO stands for Holy Day of Obligation

This definition appears somewhat frequently and is found in the following Acronym Finder categories:

  • Organizations, NGOs, schools, universities, etc.

See other definitions of HDO

Other Resources:
We have 29 other meanings of HDO in our Acronym Attic

Samples in periodicals archive:

31: The anticipatory Mass for the Solemnity of Mary, Mother of God -- a holy day of obligation -- will be celebrated at 5:15 p.