[いっせいちだい;いっせいいちだい(ik), isseichidai ; isseiichidai (ik)] (n, adj-no) once in a lifetime; the first and last occurrence (event, experience) of one's lifetime
[キセルじょうしゃ, kiseru jousha] (n, vs) (See 煙管乗り) cheating on train fare by buying tickets covering only the first and last portions of the journey (so-called because traditional pipes had metal only in two short segments at the ends)