The plural of erectility; instances or conditions of being capable of becoming erect, especially referring to biological structures.
From 'erect' plus the suffix '-ility' (from Latin '-ilitas') which creates nouns meaning states or qualities. The '-ilities' ending is a plural of this abstract noun formation.
Medical terminology often relies on these formal '-ility' constructions to discuss biological capacity—it's how professional language lets doctors discuss body functions with precise clinical distance.
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