The Collaborative International Dictionary of English v.0.48:

Danger \Dan"ger\, n. [OE. danger, daunger, power, arrogance,
   refusal, difficulty, fr. OF. dagier, dongier (with same
   meaning), F. danger danger, fr. an assumed LL. dominiarium
   power, authority, from L. dominium power, property. See
   Dungeon, Domain, Dame.]
   1. Authority; jurisdiction; control. [Obs.]
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            In dangerhad he . . . the young girls. --Chaucer.
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   2. Power to harm; subjection or liability to penalty. [Obs.]
      See In one's danger, below.
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            You stand within his danger, do you not? --Shak.
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            Covetousness of gains hath brought [them] in
            dangerof this statute.                --Robynson
                                                  (More's
                                                  Utopia).
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   3. Exposure to injury, loss, pain, or other evil; peril;
      risk; insecurity.
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   4. Difficulty; sparingness. [Obs.] --Chaucer.
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   5. Coyness; disdainful behavior. [Obs.] --Chaucer.
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   In one's danger, in one's power; liable to a penalty to be
      inflicted by him. [Obs.] This sense is retained in the
      proverb, "Out of debt out of danger."
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            Those rich man in whose debt and danger they be not.
                                                  --Robynson
                                                  (More's
                                                  Utopia).

   To do danger, to cause danger. [Obs.] --Shak.

   Syn: Peril; hazard; risk; jeopardy.

   Usage: Danger, Peril, Hazard, Risk, Jeopardy.
          Danger is the generic term, and implies some
          contingent evil in prospect. Peril is instant or
          impending danger; as, in peril of one's life. Hazard
          arises from something fortuitous or beyond our
          control; as, the hazard of the seas. Risk is doubtful
          or uncertain danger, often incurred voluntarily; as,
          to risk an engagement. Jeopardy is extreme danger.
          Danger of a contagious disease; the perils of
          shipwreck; the hazards of speculation; the risk of
          daring enterprises; a life brought into jeopardy.
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The Collaborative International Dictionary of English v.0.48:

Danger \Dan"ger\, v. t.
   To endanger. [Obs.] --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

danger
    n 1: the condition of being susceptible to harm or injury; "you
         are in no danger"; "there was widespread danger of disease"
         [ant: safety]
    2: a venture undertaken without regard to possible loss or
       injury; "he saw the rewards but not the risks of crime";
       "there was a danger he would do the wrong thing" [syn:
       risk, peril, danger]
    3: a cause of pain or injury or loss; "he feared the dangers of
       traveling by air"
    4: a dangerous place; "He moved out of danger"

The Devil's Dictionary (1881-1906):

DANGER, n.

    A savage beast which, when it sleeps,
        Man girds at and despises,
    But takes himself away by leaps
        And bounds when it arises.
                                                          Ambat Delaso