Englishfor English speakers
reference
Noun
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A reference is something that can be compared to.
When making your model, use the model I created as a reference.
reference
Verb
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When you reference something, you cite it as a source.
Reference the dictionary for the definition of this word.
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When you reference something, you mention it.
AIDS
Noun
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AIDS is a disease which destroys the natural system of protection that the body has against other diseases.
The AIDS epidemic in the United States began in the 1980s.
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AIDS is an abbreviation for 'acquired immune deficiency syndrome'.