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ordinal number any number that indicates a position in a numbered order. "First," "third," "fifteenth," and "thousandth" are ordinal numbers.
ordinarily as a rule; usually.
ordinary usual or normal. [3 definitions]
Ore. an abbreviation for Oregon.
ore a rock or mineral from which a metal or other useful substance can be removed.
Oregon a state in the northwestern United States on the Pacific Coast. Its capital is Salem. (abbreviated: OR)
or else or you will be sorry.
organ a musical instrument with a keyboard. It is played by pressing keys attached to a device that forces air through pipes. [2 definitions]
organic having to do with or coming from living things. [2 definitions]
organism an individual living thing, such as a plant, an animal, or a bacteria.
organization the act or process of organizing. [3 definitions]
organize to set in order; arrange in an orderly way. [3 definitions]
organized tending to organize one's tasks, surroundings, and the like.
orient (capitalized) the countries east and southeast of Europe; Asia; the Far East. [2 definitions]
oriental (often capitalized) of or having to do with the countries east and southeast of Europe. [2 definitions]
orientation the act or process of preparing oneself or others for a new situation.
origami the Japanese art or technique of folding paper into pleasing figures.
origin the point or place from which something comes; source. [2 definitions]
original first; earliest. [6 definitions]
originality the ability to think or act in a new way or as an individual. [2 definitions]
originally at first.