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\ ˌse-mē-ə-ˈrekt 
, ˌse-ˌmī-, -mi- \
, ˌse-ˌmī-, -mi- \variants:
or less commonly semierect
Definition of semi-erect
1 : incompletely upright in bodily posture
semi-erect primates
2 : erect for half the length
semi-erect stems
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The first known use of semi-erect was in 1822
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