Entry from US English dictionary
1The gender of those nouns in English that are not limited to either sex, such as cousin or spouse. 2In some languages, such as Latin, the gender of those nouns that may be either masculine or feminine but not neuter. 3In some languages, such as modern Danish, the gender of those nouns derived from the earlier masculine and feminine genders that do not belong to the neuter gender.
More definitions of common genderDefinition of common gender in: