a section of a section
a part of a part
i.e., a part of something already divided
a self-contained part of a larger composition (written or musical) "he always turns first to the business section" "the history of this work is discussed in the next section"
a division of some larger or more complex organization "a branch of Congress" "botany is a branch of biology" "the Germanic branch of Indo-European languages"
the act of subdividing
division of something previously divided