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Children's Dictionary
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aunt the sister of one's mother or father. [2 definitions]
auricle the part of the ear that can be seen. [2 definitions]
aurora australis bands of light that appear in the skies at night near the South Pole; southern lights.
aurora borealis bands of light that appear in the skies at night near the North Pole; northern lights.
austere being or looking very stern and serious. [2 definitions]
austerity the condition or quality of being very stern and serious.
Australia the smallest continent. Australia is southeast of Asia, between the Indian and Pacific Oceans. It is in the Eastern Hemisphere. [2 definitions]
Australian of or having to do with Australia, or its people or languages. [2 definitions]
Austria a country in central Europe. Vienna is the capital of Austria.
authentic real, genuine, or true.
author the writer of a book, play, story, or other written work.
authoritative having or showing authority. [2 definitions]
authority the right or power to give orders, make decisions, or control people. [3 definitions]
authorize to give authority to. [2 definitions]
auto see "automobile."
auto- a prefix that means done by oneself or itself.
autobiography the story of a person's life written or told by that person.
autograph the name of a person, especially a famous person, written in his or her own handwriting. [2 definitions]
automated teller machine a computerized machine used for banking.
automatic working or operating by itself. [2 definitions]
automation the use of machines rather than people to do work.