erectness

Concise Oxford English Dictionary © 2008 Oxford University Press:
erect/ɪˈrekt/

▶adjective rigidly upright or straight.

■ (of the penis, clitoris, or nipples) enlarged and rigid, especially in sexual excitement.

▶verb construct (a building, wall, etc.).

■ create or establish (a theory or system).

– derivatives
erectable adjective,
erectly adverb,
erectness noun,
erector noun.

– origin ME: from L. erect-, erigere ‘set up’.