Definition of section

• 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 very thin slice (of tissue or mineral or other substance) for examination under a microscope; "sections from the left ventricle showed diseased tissue"
• a distinct region or subdivision of a territorial or political area or community or group of people; "no section of the nation is more ardent than the South"; "there are three synagogues in the Jewish section"