The Collaborative International Dictionary of English v.0.48:
Erectness \E*rect"ness\, n. Uprightness of posture or form. [1913 Webster]WordNet (r) 3.0 (2006):
erectness n 1: the property of being upright in posture [syn: erectness, uprightness] 2: position at right angles to the horizon [syn: verticality, verticalness, erectness, uprightness]