/ ɪˈrekʃn; NAmE / noun
1.
[ C ] if a man has an erection , his penis is hard and stands up because he is sexually excited :
to get / have an erection
2.
[ U ] ( formal ) the act of building sth or putting it in a vertical position :
the erection of scaffolding around the building
3.
[ C ] ( formal ) a structure or building, especially a large one
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WORD ORIGIN
late Middle English : from Latin erectio(n-) , from erigere set up, from e- (variant of ex- ) out + regere to direct.