sec·ond class • n. [in sing.] a set of people or things grouped together as the second best. ∎ the second-best accommodations in an aircraft, train, or ship. ∎ Brit. the second-highest division in the results of the examinations for a university degree: he obtained a second class in modern history.• adj. & adv. of the second-best quality or in the second division: [as adj.] until 1914 women were thought of as second-class citizens. ∎ of or relating to the second-best accommodations in an aircraft, train, or ship: [as adj.] I want second-class tickets | [as adv.] they don't fly second-class. ∎ of or relating to a class of mail having lower priority than first-class mail: [as adj.] second-class postage stamps. ∎ (in North America) denoting a class of mail that includes newspapers and periodicals. ∎ [as adj.] Brit. of or relating to the second-highest division in a university examination: a respectable second-class degree.