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Why is the ninth month called September?

crossed

[krawst, krost] /krɔst, krɒst/
adjective, Mathematics
1.
(of partial derivatives) mixed, especially of order two.
Origin
cross + -ed2
Related forms
well-crossed, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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