Added 9 October 2026 subsection noun Categories: ThingsUncommon Words noun ! Definition from WordNet 3.1, Princeton University. More about subsection at Wordnik → Where our words come from → A section of a section; a part of a part; i.e., a part of something already divided. Related Words: subdivisionsubpartsectionsubparagraphsubtitlesubheadingparagraphheadingarticleitemrulepoint Back to today's word