Definition: An unidentified woman.
Example: 1) The police found Jane Doe number 1 buried under a blanket in the back yard.
Definition: The average American woman.
Example: 1) Jane Doe spends most of her time shopping for the latest fashions.
Etymology: This is the female version of 'John Doe', which has been used for hundreds of years to refer to a typical, average man, particularly in legal cases or in reference to unidentified dead bodies. Both 'Jane' and 'John' are very common names.