The Collaborative International Dictionary of English v.0.48:

Consistence \Con*sist"ence\, Consistency \Con*sist"en*cy\, n.
   [Cf. F. consistance.]
   1. The condition of standing or adhering together, or being
      fixed in union, as the parts of a body; existence;
      firmness; coherence; solidity.
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            Water, being divided, maketh many circles, till it
            restore itself to the natural consistence. --Bacon.
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            We are as water, weak, and of no consistence. --Jer.
                                                  Taylor.
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            The same form, substance, and consistency. --T.
                                                  Burnet.
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   2. A degree of firmness, density, viscosity, or spissitude; a
      measure of the ability to hold together when manipulated.

   Syn: body.
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              Let the expressed juices be boiled into the
              consistence of a sirup.             --Arbuthnot.
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   3. That which stands together as a united whole; a
      combination.
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            The church of God, as meaning the whole consistence
            of orders and members.                --Milton.
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   4. Firmness of constitution or character; substantiality;
      durability; persistency.
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            His friendship is of a noble make and a lasting
            consistency.                          --South.
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   5. Agreement or harmony of all parts of a complex thing among
      themselves, or of the same thing with itself at different
      times; the harmony of conduct with profession; congruity;
      correspondence; as, the consistency of laws, regulations,
      or judicial decisions; consistency of opinions;
      consistency of conduct or of character.
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            That consistency of behavior whereby he inflexibly
            pursues those measures which appear the most just.
                                                  --Addison.
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            Consistency, thou art a jewel.        --Popular
                                                  Saying.
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WordNet (r) 3.0 (2006):

consistence
    n 1: a harmonious uniformity or agreement among things or parts
         [syn: consistency, consistence] [ant: inconsistency]
    2: the property of holding together and retaining its shape;
       "wool has more body than rayon"; "when the dough has enough
       consistency it is ready to bake" [syn: consistency,
       consistence, eubstance, body]