English
erectness
From erect + -ness.
A compound of erect + -ness
Proto-Indo-European *h₃reǵ- ‘to straighten’
…
Latin regō ‘to direct, keep straight, guide’
Latin ērigō ‘raise, set up’
Latin ērectus ‘upright’
Middle English erect
English erect
Today it means
noun The state of being erect, or of having an erect posture.
Language periods are conventional ranges, not dates for this word.
Etymograph / erectness