Webster's English Dictionary

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expectancy

ex.pec.tan.cy or ex.pec.tance \ik-'spek-t*n-se-\ \-t*n(t)s\ n 1: the act, 
   action, or state of expecting  2: the state of being expected  3a: 
   something expected  3b: the expected amount (as of the number of years of 
   life) based on statis tical probability