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Related to in posse: posse comitatus
in pos·se(ĭn pŏs′ē)
adv. & adj.
In potential but not in actuality.
[Medieval Latin : Latin in, in + Latin posse, to be able.]
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.
in posse(ɪn ˈpɒsɪ)
(Literary & Literary Critical Terms) possible; potential. Compare in esse
[Latin, literally: in possibility]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
A Latin phrase meaning possible or potential.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited