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Why is the ninth month called September?

out-

1.
a prefixal use of out, adv., occurring in various senses in compounds (outcast, outcome, outside), and serving also to form many transitive verbs denoting a going beyond, surpassing, or outdoing in the particular action indicated (outbid, outdo, outgeneral, outlast, outstay, outrate).
Origin
Middle English; Old English ūt-; see out
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for out-

out-

prefix
1.
excelling or surpassing in a particular action outlast, outlive
2.
indicating an external location or situation away from the centre outpost, outpatient
3.
indicating emergence, an issuing forth, etc outcrop, outgrowth
4.
indicating the result of an action outcome
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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3
4
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