The Collaborative International Dictionary of English v.0.48:

Manhood \Man"hood\, n. [Man- + -hood.]
   1. The state of being man as a human being, or man as
      distinguished from a child or a woman.
      [1913 Webster]

   2. Manly quality; virility; courage; bravery; resolution.
      [1913 Webster]

            I am ashamed
            That thou hast power to shake my manhood thus.
                                                  --Shak.
      [1913 Webster]

   3. The genitalia of a male human.
      [PJC]

   4. The condition of being a human being.
      [PJC] man hour

WordNet (r) 3.0 (2006):

manhood
    n 1: the state of being a man; manly qualities
    2: the quality of being human; "he feared the speedy decline of
       all manhood" [syn: humanness, humanity, manhood]
    3: the status of being a man

Moby Thesaurus II by Grady Ward, 1.0:

84 Moby Thesaurus words for "manhood":
   Dutch courage, adulthood, adultness, age of consent, boldness,
   braveness, bravery, chivalrousness, chivalry,
   conspicuous gallantry, courage, courageousness, determination,
   doughtiness, driving age, flower of age, force, fortitude,
   full age, full bloom, full growth, fullgrownness, gallantness,
   gallantry, gallantry under fire, gentlemanlikeness,
   gentlemanliness, greatheartedness, grit, grown-upness, guts,
   heroicalness, heroism, intestinal fortitude, intrepidity,
   intrepidness, knightliness, legal age, legalis homo,
   lionheartedness, machismo, majority, male sex, maleness, man,
   manfulness, mankind, manlihood, manlikeness, manliness,
   mannishness, martial spirit, masculineness, masculinity,
   mature age, maturity, men, menfolk, menfolks, military spirit,
   pluck, pot-valor, prime, prime of life, prowess, resolution,
   ripe age, riper years, soldierly quality, spirit, stalwartness,
   stoutheartedness, stoutness, sword side, toga virilis, valiance,
   valiancy, valor, valorousness, virility, virtue, womanhood,
   womanlihood, years of discretion