The Collaborative International Dictionary
In posse
In posse \In` pos"se\ [L.] In possibility; possible, although not yet in existence or come to pass; -- contradistinguished from in esse.
In posse
Posse \Pos"se\, n. See Posse comitatus.
In posse. See In posse in the Vocabulary.
Wiktionary
in posse
a. in possibility, having a potential to exist, in potential but not in actuality, (contradistinguished by ''in esse'') adv. in possibility, having a potential to exist, in potential but not in actuality, (contradistinguished by ''in esse'')