noun

• (uncountable) The act of building or putting up or together of something.
• (countable) Anything erected or built.
  "The Empire State Building was once the world's tallest erection."
• (uncountable or countable, ecclesiastical) Formal approval and official establishment of an institution such as a society or a monastery by higher church authorities.
  "There is some obscurity attaching to the only other one of those alleged erections of parishes, the case of Foot Dee, near Aberdeen."
• (uncountable, physiology) The physiological process by which erectile tissue, such as a penis or clitoris, becomes erect by being engorged with blood.
  "I think that the case also demonstrates some singular aspects of the penis as a narrator of tales, specifically the way in which the erection of a penis falls outside a man's conscious control and therefore threatens a carefully constructed master legal narrative in which bodily self-control graphically represents the self-government contemplated by a democratic legal society."