A Posteriori is the sixth studio album by German musical project Enigma, released on 22 September 2006 by Virgin Records.

Coupled with the album's subject matter of the collision of the Milky Way and Andromeda galaxies, A Posteriori is, compared to earlier releases, stark and foreboding.

Enigma's management subsequently stated that a new version would be included on the record, while the lead single off the album proper would be "Goodbye Milky Way".

[3] A Posteriori became the first Enigma album to be recorded using Michael Cretu's new 5.1 fully computerized mobile music studio, "Alchemist", a machine of relatively small size with a main keyboard and a number of hardware MIDI controllers with some "special" expansions and a central computer with LCD screen.

", is an Italian phrase translated to "And yet it moves", attributed to Galileo Galilei after he was sentenced by the Roman Inquisition to recant his belief in heliocentrism.