Write the address: name of the person, name of the town or village, street, number, other informations about the address, name of the country - Romania, the correct postal code (RO-.......).
A single woman's address is domnişoară; its abbreviation is D-ra.
Ms. and then your last name.
You can use Mrs., Miss, or Ms., depending on the marital status and preference of the woman.
Addressing an envelop to a woman with a boyfriend and young son: Just address the envelope to: Ms. Jane Doe & Mr. John Doe (if the young son is in their teens, but not necessary if they are a minor) & Mr. John Smith. So the envelope may read: Ms. Jane Doe & Mr. John Smith.
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When addressing an envelope to a recent widow, it is customary to write the person's name starting with the title "Mrs.". Just because a woman is a widow does not mean that a woman is not still married.
You can address a German single woman by using "Frau" followed by her last name in a formal setting. In a more casual or informal setting, you can address her using "Frau" followed by her first name.
* Dr. & Mrs. John Doe
The correct way to address the envelope is: Mr. John Doe & Dr. Jane Doe.
Proper business etiquette dictates that the man should be first even with an informal envelope however many have used the woman's name first if she is more familiar to the sender. You address as the Man's name first. ei. Mr & Mrs Stephen Kariwiec
Mrs. is a title of respect that may be used to address a married woman. Ms. is preferable, especially if you do not know what the woman's preferred title is, or if you do not know the marital status of the woman.
spinster - especially if elderly, or Miss will be the form of address to a young unmarried woman bachlorette
In this wonderful modern age you can simply write her name on the envelope. It doesn't need to label her as married, unmarried, engaged, solo, etc. For example: If the person's name is Giselle Renoir and you want to invite her to a party then simply address the envelope to Giselle Renoir at her address. If you want to invite her husband too then simply address it to Giselle and Pierre Renoir.