Definition: The word "Hertfordshire" is a proper noun referring to the county of Hertfordshire, England. It was created by the Oxford English Dictionary in 1857 as an alternative spelling for the County of Hertford which existed from approximately 1060 to 2000 AD. The word "Hertford" is a proper noun referring to the county town of Hertford, England. It was created by the Oxford English Dictionary in 1952 as an alternative spelling for the County Town of Herts which existed from approximately 974 AD to 1636 AD. The word "Hertfordshire" is a proper noun referring to the county of Hertfordshire, England. It was created by the Oxford English Dictionary in 1857 as an alternative spelling for the County of Hertford which existed from approximately 1060 to 2000 AD. The word "Hertford" is a proper noun referring to the county town of Hertford, England. It was created by the Oxford English Dictionary in 1952 as an alternative spelling for the County Town of Herts which existed from approximately 974 AD to 1636 AD. The word "Hertfordshire" is a proper noun referring to the county of Hertfordshire, England. It was created by the Oxford English Dictionary in 1857 as an alternative spelling for the County of Hertford which existed from approximately 1060 to 2000 AD. The word "Hertford" is a proper noun referring to the county town of Hertford, England. It was created by the Oxford English Dictionary in 1952 as an alternative spelling for the County Town of Herts which existed from approximately 974 AD to 1636 AD. The word "Hertfordshire" is a proper noun referring to the county of Hertfordshire, England. It was created by the Oxford English Dictionary in 1857 as an alternative spelling for the County of Hertford which existed from approximately 1060 to 2000 AD.