Definitions from Wiktionary (turnpike)

▸ noun:  A frame consisting of two bars crossing each other at right angles and turning on a post or pin, to hinder the passage of animals, but admitting a person to pass between the arms; a turnstile.
▸ noun:  A gate or bar set across a road to stop carriages, animals, and sometimes people, until a toll is paid,
▸ noun:  (Scotland) A winding stairway.
▸ noun:  (military) A beam filled with spikes to obstruct passage; a cheval de frise.
▸ noun:  (chiefly US) A toll road, especially a toll expressway.
▸ noun:  (mathematical economics) A trajectory on a finite time interval that satisfies an optimality criterion which is associated with a cost function.
▸ verb:  To form (a road, etc.) in the manner of a turnpike road, or into a rounded form, as the path of a road.

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