Unlike typical "semantic versioning", Fedora defines the following meaning to each of the three positions of a version number in a release such as: Fedora-4.1.2

4 (in '4'.1.2) - product version (i.e. Fedora4, this number will not change unless there is a significant architectural shift or project milestone in the Fedora application).
1 (in 4.'1'.2) - major version (this number increments every time there is either a non-backwards compatible API change or an equally significant project milestone)
2 (in 4.1.'2') - combined minor version and bug-fix version (this number is incremented in the course of regular, frequent, maintenance releases)