(1):
(n.) The act of venturing beyond due beyond due bounds; an overstepping of the bounds of reverence, respect, or courtesy; forward, overconfident, or arrogant opinion or conduct; presumptuousness; arrogance; effrontery.
(2):
(n.) The act of presuming, or believing upon probable evidence; the act of assuming or taking for granted; belief upon incomplete proof.
(3):
(n.) Ground for presuming; evidence probable, but not conclusive; strong probability; reasonable supposition; as, the presumption is that an event has taken place.
(4):
(n.) That which is presumed or assumed; that which is supposed or believed to be real or true, on evidence that is probable but not conclusive.