Source : Webster's Revised Unabridged Dictionary (1913)

Second-class \Sec"ond-class`\, a.
   Of the rank or degree below the best highest; inferior;
   second-rate; as, a second-class house; a second-class
   passage.

Source : WordNet®

second-class
     adj : of inferior status or quality; "a second-class citizen";
           "second-class accommodations"