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Children's Dictionary
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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.
originate to start or come into being. [2 definitions]
oriole a songbird that can be found in many parts of the world. Males have black and bright yellow or orange feathers. There are two main groups of birds that are considered orioles. There are several different kinds of orioles in each group.
Orion a hunter and giant in Greek myth. [2 definitions]
ornament something that is added to make something more beautiful to look at; decoration. [2 definitions]
ornate having a lot of decoration; fancy.
ornery mean; stubborn.
ornithology the study of birds.
orphan a child whose parents have died. [2 definitions]
orphanage a place where orphans live and are cared for.
orthodontics (used with a singular verb) the branch of dental medicine that deals with the straightening of teeth.