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orienteering a cross-country race in which competitors follow a course in unfamiliar territory by using a map and compass.
orifice an opening, such as a vent, mouth, or hole, through which something can pass.
oriflamme the red banner that was used as a battle standard by the early kings of France. [3 definitions]
orig. abbreviation of "original" or "originally."
origami the Japanese art or technique of folding paper into ornamental or representational figures. [2 definitions]
origin the point or moment of arising; source. [3 definitions]
original first in order of succession. [7 definitions]
originality the capacity to think or act as an individual or in an original way. [3 definitions]
original jurisdiction the authority of a court to be the first court to hear and decide cases on a particular matter or in a particular geographic area.
originally with reference to source or origin. [3 definitions]
original sin in Christianity, the sin of disobedience committed by Adam and Eve, for which they and all humans were made to suffer pain and mortality.
originate to arise or come into being. [3 definitions]
originative having the capacity to originate.
oriole a member of either of two families of birds in which the males have black and bright yellow or orange plumage.
Orion in Greek mythology, a giant hunter who was killed by Artemis. [2 definitions]
orison a prayer.
-orium a place or device associated with or pertaining to; -arium.
Orlon trademark for a lightweight acrylic fiber or fabric.
Ormazd Ahura Mazda.
ormolu an alloy of copper and zinc or tin that resembles gold, or a similar gilded metal, used to decorate furniture, architectural features, or jewelry.
ornament something that is added to beautify or improve appearance; decoration. [5 definitions]