What is "sadeness"

"Sadeness (Part I)" is a song by German musical project Enigma. The song was released in November 1990 as the first of four singles from the project's first album, MCMXC a.D., and upon its release, it became an international smash hit, reaching number one in 24 countries and the top ten in many others, including the United States, where it made number five on the pop chart and number one on the dance chart.