Bachelor
A bachelor was a male individual who was eligible for, but not yet married. A bachelor getting married was sometimes celebrated with a bachelor party.

In an alternate timeline where  from 2154 became stranded in 2037, several male Enterprise crewmembers, including Malcolm Reed, ended up as bachelors, since only one third of the ship's crew was female. ()

In 2367, Geordi La Forge claimed that he enjoyed bachelor's life too much to enter a serious relationship. ()

In 2372, while Keiko O'Brien was on Bajor, her husband Miles O'Brien set up a  in their bedroom. When Keiko learned of this, she accused him of trying to live like a bachelor again. () Later that year, when Keiko was about to return, Miles had to clean up their very untidy quarters, which Julian Bashir likened as a sculpture, calling it "a monument to your year as a bachelor." ()

In 2375, when the Silver Blood copy of Tom Paris was to be married to B'Elanna Torres, Kathryn Janeway told him that his bachelor days were over. ()

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