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Why is the ninth month called September?

underived

[uhn-di-rahyvd] /ˌʌn dɪˈraɪvd/
adjective
1.
not derived; fundamental, as an axiom or postulate; immediate.
Origin
1620-1630
1620-30; un-1 + derived
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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