Etymology
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erection (n.)

mid-15c., "establishment; advancement," from Late Latin erectionem (nominative erectio), noun of action from past participle stem of erigere "to set up, erect" (see erect (adj.)). Meanings "the putting up" (of a building, etc.), "stiffening of the penis" (also sometimes of the turgidity and rigidity of the clitoris) are both from 1590s.

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Definitions of erection

erection (n.)
an erect penis;
Synonyms: hard-on
erection (n.)
a structure that has been erected;
erection (n.)
the act of building or putting up;
Synonyms: erecting
From wordnet.princeton.edu