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Related to prepense: Malice prepense
Contemplated or arranged in advance; premeditated: malice prepense.
[From Middle English, past participle of purpensen, to premeditate, from Anglo-Norman purpenser : pur-, before (from Latin pro-; see pro-1) + penser, to think (from Latin pēnsāre; see (s)pen- in Indo-European roots).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Law) (postpositive) (usually in legal contexts) arranged in advance; premeditated (esp in the phrase malice prepense)
[C18: from Anglo-Norman purpensé, from Old French purpenser to consider in advance, from penser to think, from Latin pēnsāre to weigh, consider]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
planned or intended in advance; premeditated.
[1695–1705; pre- + -pense < Latin pēnsus, past participle of pendere to weigh, consider; see pensive]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.