Lit., mine; that which is mine; -- used in the phrase
meum et tuum, or
meum and tuum;
as, to confound meum and tuum, to fail to distinguish one's own property from that of others; to be dishonest.
"Ancestors . . . generally esteemed more renowned for ancient family and high courage than for accurately regarding the trifling distinction of meum and tuum."
[Webster 1913 Suppl.]