SUBSECTION
subsection, subdivision
(noun) a section of a section; a part of a part; i.e., a part of something already divided
Source: WordNet® 3.1
Etymology
Noun
subsection (plural subsections)
A defined part of a section.
(legal) A subpart of a legal document such as law.
Coordinate term: subparagraph
(taxonomy, zoology) An informal taxonomic category below section and above family.
(taxonomy, botany) A taxonomic rank below the section, but above the species.
Verb
subsection (third-person singular simple present subsections, present participle subsectioning, simple past and past participle subsectioned)
To insert subsections (into some text, etc.).
Source: Wiktionary