Source : Webster's Revised Unabridged Dictionary (1913)

July \Ju*ly"\, n.; pl. {Julies}. [L. Julius; -- named from Caius
   Julius C[ae]sar, who was born in this month: cf. F. Juillet.]
   The seventh month of the year, containing thirty-one days.

   Note: This month was called Quintilis, or the fifth month,
         according to the old Roman calendar, in which March was
         the first month of the year.