The Collaborative International Dictionary of English v.0.48:

Conquest \Con"quest\, n. [OF. conquest, conqueste, F.
   conqu[^e]te, LL. conquistum, conquista, prop. p. p. from L.
   conquirere. See Conquer.]
   1. The act or process of conquering, or acquiring by force;
      the act of overcoming or subduing opposition by force,
      whether physical or moral; subjection; subjugation;
      victory.
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            In joys of conquest he resigns his breath.
                                                  --Addison.
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            Three years sufficed for the conquest of the
            country.                              --Prescott.
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   2. That which is conquered; possession gained by force,
      physical or moral.
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            Wherefore rejoice? What conquest brings he home?
                                                  --Shak.
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   3. (Feudal Law) The acquiring of property by other means than
      by inheritance; acquisition. --Blackstone.
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   4. The act of gaining or regaining by successful struggle;
      as, the conquest of liberty or peace.
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   The Conquest (Eng. Hist.), the subjugation of England by
      William of Normandy in 1066. The Norman Conquest.

   Syn: Victory; triumph; mastery; reduction; subjugation;
        subjection.
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WordNet (r) 3.0 (2006):

Norman Conquest
    n 1: the invasion and settlement of England by the Normans
         following the battle of Hastings (1066)