A penthouse is a special apartment or living space on the top floor of a tall building, often larger, more private, and more expensive than other apartments. It may have a terrace or great views.
“Penthouse” originally came from Old French *apentis*, meaning “attached building” or “lean-to,” which became Middle English *pentis*. Over time, people connected it with “house,” and its meaning shifted to a special top-floor dwelling.
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