Definativley defining a reboot

Can anyone definitively define what a reboot is? The term has been around for decades but it was made popular with the release of Batman Begins in 2005, and since then, countless films have been labeled "reboot" as a lazy way to capitalize on Begin's success. In order for a film to be classed as a reboot, it has to be set in a new continuity from previous films and to have a different style.

The way I see it there are two different kinds of reboots; financially and aesthetically. Financial reboots are films that are labeled so by executives because, like I said, of the terms connotations with "Batman Begins". Aesthetic reboots are the opposite. These are films that are reboots based on how they are made and weather they have any connections to previous films. Also, it is worth mentioning that in order for a reboot to be a "reboot", said reboot will need to spawn sequels, otherwise this reboot attempt has failed.

Financial reboots:                 

1. Star Trek 
2. Dredd
3. Conan the Barbarian
4. Friday the 13th
5. X-men: First Class

Aesthetic Reboots:

1. Batman Begins
2. Man of Steel
3. Casino Royale
4. The Amazing Spider-man