useless trivia: What Word Means: Moves Steadily And Smoothly?

Questions

In 1845 Wagner's opera ---------- performed for 1st time. ?

In 1862 ---------- Lumiere, made 1st movie (Workers Leaving Lumiere Factory), born. ?

In 1862 Auguste---------- , made 1st movie (Workers Leaving Lumiere Factory), born. ?

In 1872 World's largest ---------- nugget (215 kg) found in New South Wales. ?

In 1872 World's largest gold nugget (215 kg) found in---------- . ?