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func·tion·al im·po·tence(fŭngk'shŭn-ăl im'pŏ-tĕns)
An intermittent erectile dysfunction that is more psychogenic than physiologic in source; varies in degree depending on circumstance and sexual partner.
Impotence not due to an organic or anatomical defect; usually of psychogenic origin. The individual may experience impotence with one or more sexual partners, but not with others.
See also: impotence