Noun impotence has 2 senses
  1. powerlessness, impotence, impotency - the quality of lacking strength or power; being weak and feeble
    --1 is a kind of quality
    --1 has particulars:
     helplessness, weakness, impuissance; unpersuasiveness; uninterestingness; paper tiger; ineffectiveness, ineffectualness, ineffectuality
  2. impotence, impotency - an inability (usually of a male) to copulate
    --2 is a kind of sterility, infertility
    --2 has particulars: erectile dysfunction, male erecticle dysfunction, ED