(Roman Catholicism, theology) A sin which causes the loss of God's grace, leading to eternal damnation, unless the sinner repents, which includes their intent to confess and atone; such a sin is defined as a transgression against one of the Ten Commandments with the full knowledge and deliberate consent of the sinner.

plural of mortal sin

A dangerous and daring jump with possibly lethal outcome. / (figuratively) A risky, dangerous or crucial step or undertaking.

Fighting to the death; a physical fight between persons or groups wherein each side is attempting to kill the other. / (by extension) Any very spirited competition between persons or groups.

An official statement of the number of deaths in a place or district within a given time. / A district required to be covered by such a statement.

One who is not a god; a human being. / (idiomatic) An ordinary person, without special expertise or status.

The occurrence of death of very young children under one year old.

A person of lower rank, station or ability.

plural of bill of mortality

plural of mortal coil