Definition
A person is single if he/she has never been married.
Married is the marital status of a person who has been united in matrimony with another person of opposite sex through a religious or civil rite, or who lives together consensually with another as husband or wife. To be considered married, the couple must still be living together; or, if living apart from each other, the separation must only be temporary.
Report as widowed a person who has been married before; whether formally or consensually, if his/her marital partner has died. In case the widowed has remarried, his/her marital status should be married.
A person is considered divorced/separated, if the person is permanently separated from his/her spouse, legally, or through mutual consent.
A person whose marriage has been annulled or dissolved can therefore, remarry.