ipso jure,advb.phr.|ˈɪpsəʊˈdʒʊəriː| [L.] By the operation of the law itself. 1909in Webster.1913Act 3 & 4 Geo. V c. 20 §97 The act and warrant of confirmation in favour of the trustee shall ipso jure transfer to and vest in him..the whole property of the debtor.