The Collaborative International Dictionary of English v.0.48:

Mankind \Man"kind`\, a.
   Manlike; not womanly; masculine; bold; cruel. [Obs]
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         Are women grown so mankind? Must they be wooing?
                                                  --Beau. & Fl.
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         Be not too mankind against your wife.    --Chapman.
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The Collaborative International Dictionary of English v.0.48:

mankind \man`kind"\, n. [AS. mancynn. See Kin kindred, Kind,
   n.]
   1. The human race; man, taken collectively.
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            The proper study of mankind is man.   --Pore.
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   2. Men, as distinguished from women; the male portion of
      human race. --Lev. xviii. 22.
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   3. Human feelings; humanity. [Obs] --B. Jonson.
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WordNet (r) 3.0 (2006):

mankind
    n 1: 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]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

MANKIND. Persons of the male sex; but in a more general sense, it includes
persons of both sexes; for example, the statute of 25 Hen. VIII., c. 6,
makes it felony to commit, sodomy with mankind or beast. Females as well as
males axe included under the term mankind. Fortesc. 91; Bac. Ab. Sodomy. See
Gender.