A commonly accepted and encompassing definition of marriage is the following: a formal union and social and legal contract between two individuals
that unites their lives legally, economically, and emotionally.
Being married also gives legitimacy to sexual relations within the marriage is a union between individual people.
The fact of being married is called wedlock. Very often, people celebrate that they are getting married.
The ceremony is usually called a wedding. In most of the world,
this is a union between a man and a woman (who become husband and wife).