The Collaborative International Dictionary of English v.0.48:

Humanity \Hu*man"i*ty\, n.; pl. Humanities. [L. humanitas: cf.
   F. humanit['e]. See Human.]
   1. The quality of being human; the peculiar nature of man, by
      which he is distinguished from other beings.
      [1913 Webster]

   2. Mankind collectively; the human race.
      [1913 Webster]

            But hearing oftentimes
            The still, and music humanity.        --Wordsworth.
      [1913 Webster]

            It is a debt we owe to humanity.      --S. S. Smith.
      [1913 Webster]

   3. The quality of being humane; the kind feelings,
      dispositions, and sympathies of man; especially, a
      disposition to relieve persons or animals in distress, and
      to treat all creatures with kindness and tenderness. "The
      common offices of humanity and friendship." --Locke.
      [1913 Webster]

   4. Mental cultivation; liberal education; instruction in
      classical and polite literature.
      [1913 Webster]

            Polished with humanity and the study of witty
            science.                              --Holland.
      [1913 Webster]

   5. pl. (With definite article) The branches of polite or
      elegant learning; as language, rhetoric, poetry, and the
      ancient classics; belles-letters.
      [1913 Webster]

   Note: The cultivation of the languages, literature, history,
         and arch[ae]ology of Greece and Rome, were very
         commonly called liter[ae] humaniores, or, in English,
         the humanities, . . . by way of opposition to the
         liter[ae] divin[ae], or divinity. --G. P. Marsh.
         [1913 Webster]

WordNet (r) 3.0 (2006):

humanity
    n 1: the quality of being humane
    2: the quality of being human; "he feared the speedy decline of
       all manhood" [syn: humanness, humanity, manhood]
    3: all of the living human inhabitants of the earth; "all the
       world loves a lover"; "she always used `humankind' because
       `mankind' seemed to slight the women" [syn: world, human
       race, humanity, humankind, human beings, humans,
       mankind, man]

Moby Thesaurus II by Grady Ward, 1.0:

105 Moby Thesaurus words for "humanity":
   Adam, Hominidae, Homo sapiens, acceptance, affectionateness,
   beneficence, benevolence, benignancy, benignity, brotherhood,
   charitableness, clay, clemency, clementness, commiseration,
   community, compassion, condolence, consideration, easiness,
   easygoingness, fallen humanity, favor, feeling, feeling of kinship,
   fellow feeling, flesh, forbearance, forbearing, forgiveness,
   frailty, fraternal feeling, generation of man, generosity,
   gentleness, genus Homo, goodness, goodness of heart, grace,
   graciousness, heart of gold, helpfulness, hominid, homo,
   human equation, human family, human frailty, human nature,
   human race, human species, human weakness, humaneness, humankind,
   humanness, kindheartedness, kindliness, kindly disposition,
   kindness, laxness, le genre humain, lenience, leniency,
   lenientness, lenity, loving kindness, magnanimity, man, mankind,
   mercifulness, mercy, mildness, mitigation, moderateness,
   mortal flesh, mortality, mortals, niceness, pardon, pathos,
   patience, people, pity, quarter, race of man, relief, reprieve,
   ruth, self-pity, sensitivity, society, softheartedness, softness,
   soul of kindness, sympathy, tenderheartedness, tenderness,
   the masses, the public, tolerance, understanding, unselfishness,
   warmheartedness, warmth, warmth of heart, weakness



The Devil's Dictionary (1881-1906):

HUMANITY, n.  The human race, collectively, exclusive of the
anthropoid poets.