noun

• (typography) A unit of measurement equal to half an em (half the height of the type in use).
  "That the price of work, paid for by letters be advanced from fourpence to fourpence halfpenny per thousand, including English and brevier; and, in leaded matter, the ems and ens at the beginnings and ends of the lines not to be reckoned in the width."

pron

• (dialectal, Newfoundland) Him.
  "Such a strappen fine gentleman as he was, too. Yes, I rather like en sometimes."
• (dialectal, Newfoundland) It (when the thing being referred to is masculine).

name

• (philosophy) The Nicomachean Ethics, Aristotle's best-known work on ethics.

noun

• (pathology) Initialism of erythema nodosum.
• (medicine) Initialism of enrolled nurse.
• (ice hockey, floorball) Initialism of empty net.