A motion is a request that the Chamber makes to the government. The government is then asked to implement what is in the motion. For a motion to pass the Parliament, at least 31 of the 60 deputies in the chamber must approve it.
In addition to the motions, there are also resolutions. These are structured in the same way as the motions, with the difference that the chamber itself is asked to do something.
The Chamber’s Rules describe in detail how applications are to be made. (to find here: http://legilux.public.lu/eli/etat/leg/tc/2015/06/09/n1/jo )