noun

• A part, piece, subdivision of anything.
  "The horn section is the group of symphonic musicians who play the French horn."
• A cross-section (image that shows an object as if cut along a plane).
• A cross-section (image that shows an object as if cut along a plane).
• A cross-section (image that shows an object as if cut along a plane).

verb

• (UK, Australia, New Zealand) To commit (a person) to a hospital for mental health treatment as an involuntary patient. So called after various sections of legal acts regarding mental health.
  "Tribunals were set up as watchdogs in cases of compulsory detention (sectioning). […] Informal patients, however, could be sectioned, and this was often a fear of patients once they were in hospital."
• (medicine) To perform a cesarean section on (someone).
  ""But if she's gone into active labour she could be bleeding massively and you may have to section her there and then.""