Single may refers to one (1) person or thing, and nothing less or more than one. Therefore
A single person is someone who is unmarried, not in a relationship and not part of a civil union. In common usage, the term 'single' is often used to refer to someone who is not involved in any type of serious romantic relationship, including long-term dating, engagement, marriage, or someone who is 'single by choice'. Single people may participate in dating and other activities to find a long-term partner or spouse.