Oblates

Oblates, the name given to an organisation of secular priests living in community, founded by St. Charles Borromeo at the end of the 16th century, and who are ready to render any services the bishop may require of them.

Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)

Objective * Oboe
[wait for the fun]
Oates, Titus
Obadiah
Oban
Obeid
Obelisk
Ober-Ammergau
Oberlin, Jean Friedrich
Oberon
Obi
Objective
Oblates
Oboe
Obelus
O'Brien, William
O'Brien, William Smith
Obscurantist
Obsidian
Occam
Occasionalism
Oceania
Oceania