The attitude or belief that a particular doctrine, culture, or social system, particularly a religious or political one, is superior and that it will or should triumph over all others.

plural of triumphalism

In a triumphal manner

Of, relating to, or being a triumph. / That celebrates or commemorates a triumph or victory.

(obsolete) A token of victory.

plural of triumphal

A monumental arch that commemorates a victory.

plural of triumphal arch