| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
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| SUFFIX: | Used to form adverbs: They were caught unawares. He works nights. | | ETYMOLOGY: | Middle English -es, -s, genitive sing. suff., from Old English -es.
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| The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved. |
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