daemon 
 
-  Type: Boolean
  -  Range / Valid values: on, off
  -  Default: off
  -  Group: System Processing
 
 
Start in daemon (background) mode and release terminal. This option must be placed in motion.conf and not in a thread config file., Start in daemon (background) mode and release terminal. This option must be placed in motion.conf and not in a thread config file.
Daemon mode is what you typically will use once you are done experimenting and have motion run permanently in the background on a server.
Wonder about the word and its spelling. Look 
here!