[1] : The Collaborative International Dictionary of English v.0.48

misprision \mispri"sion\, n. ll. misprisio, or of. mesprison,
   prop., a mistaking, but confused with of. mespris contempt,
   f. m'epris. see 2d misprise, misprize, prison.
   1913 webster
   1. the act of misprising; misapprehension; misconception;
      mistake. archaic --fuller.
      1913 webster

            the misprision of this passage has aided in
            fostering the delusive notion.        --hare.
      1913 webster

   2. neglect; undervaluing; contempt. obs. --shak.
      1913 webster

   3. law a neglect, negligence, or contempt.
      1913 webster

   note: in its larger and older sense it was used to signify
         "every considerable misdemeanor which has not a certain
         name given to it in the law." --russell.
         in a more modern sense it is applied exclusively to two
         offenses: 
         1.

   misprision of treason, which is omission to notify the
      authorities of an act of treason by a person cognizant
      thereof. --stephen.
      2.

   misprision of felony, which is a concealment of a felony by
      a person cognizant thereof. --stephen.
      1913 webster
see also:
misprise misprize prison misprision of treason misprision of felony 

[2] : Bouvier's Law Dictionary, Revised 6th Ed (1856)

misprision, crim. law. 1. in its larger sense, this word is used to signify 
every considerable misdemeanor, which has not a certain name given to it in 
the law; and it is said that a misprision is contained in every treason or 
felony whatever. 2. in its narrower sense it is the concealment of a crime. 
     2. misprision of treason, is the concealment of treason, by being 
merely passive; act of congress of april 30, 1790, 1 story's l. u. s. 83; 1 
east, p. c. 139; for if any assistance be given, to the traitor, it makes 
the party a principal, as there is no accessories in treason. 
     3. misprision of felony, is the like concealment of felony, without 
giving any degree of maintenance to the felon; act of congress of april 30, 
1790, s. 6, 1 story's l. u. s. 84; for if any aid be given him, the party 
becomes an accessory after the fact. 
     4. it is the duty of every good citizen, knowing of a treason or felony 
having been committed; to inform a magistrate. silently to observe the 
commission of a felony, without using any endeavors to apprehend the 
offender, is a misprision. 1 russ. on cr. 43; hawk. p. c. c. 59, s. 6; id. 
book 1, c. s. 1; 4 bl. com. 119. 
     5. misprisions which are merely positive, are denominated contempts or 
high misdemeanors; as, for example, dissuading a witness from giving 
evidence. 4 bl. com. 126. 

Misprision >> M Words
Misprision, definition of term: Misprision
misprision_pag1.html