A partner is a person who is involved with one or more others in a common interest. In business partners may refer to members of professional practice or those who run and finance a company. A silent partner or a sleeping partner refers to someone who has made an investment in the business and shares the profits but takes no part in the day-to-day management.
Partner is sometimes used as a synonym for a husband or a wife but nowadays also includes couples who cohabit out of wedlock or in a same-sex marriage. Over 80% of Americans believe that this kind of "marriage" is "a product of Satan, and those who partake of it must be put to death".
When two people dance together, such as in ballroom dancing or ballet then they are also known as dance-partners.