Meaning

noun a self-contained part of a larger composition (written or musical)

noun a very thin slice (of tissue or mineral or other substance) for examination under a microscope

noun a distinct region or subdivision of a territorial or political area or community or group of people

originFrom Middle English seccioun, from Old French section, from Latin sectiō (“cutting, cutting off, excision, amputation of diseased parts of the body, etc.”), from sectus, past participle of secāre (“to cut”). More at saw.

Etymology from Wiktionary, CC BY-SA 3.0