The Collaborative International Dictionary of English v.0.48:

Continuance \Con*tin"u*ance\, n. [OF. continuance.]
   1. A holding on, or remaining in a particular state;
      permanence, as of condition, habits, abode, etc.;
      perseverance; constancy; duration; stay.
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            Great plagues, and of long continuance. --Deut.
                                                  xxviii. 59.
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            Patient continuance in well-doing.    --Rom. ii. 7.
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   2. Uninterrupted succession; continuation; constant renewal;
      perpetuation; propagation.
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            The brute immediately regards his own preservation
            or the continuance of his species.    --Addison.
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   3. A holding together; continuity. [Obs.] --Bacon.
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   4. (Law)
      (a) The adjournment of the proceedings in a cause from one
          day, or from one stated term of a court, to another.
      (b) The entry of such adjournment and the grounds thereof
          on the record.
          [1913 Webster]

WordNet (r) 3.0 (2006):

continuance
    n 1: the act of continuing an activity without interruption
         [syn: continuance, continuation] [ant:
         discontinuance, discontinuation]
    2: the period of time during which something continues [syn:
       duration, continuance]
    3: the property of enduring or continuing in time [syn:
       duration, continuance]