1 [C] if a man has an erection, his PENIS is hard and upright because he is sexually excited:
to get / have an erection
2 [U] (formal) the act of building sth or putting it in an upright position:
the erection of temporary scaffolding around the building site
3 [C] (formal) a structure or building, especially a large one:
The cafe was a bleak, concrete erection with plastic tables and chairs.
