Noun
The act of superseding, or the state of being superseded; supersedure.
Source: Webster's dictionaryFollowing the League's supersession by the United Nations in 1946, South Africa refused to surrender its earlier mandate to be replaced by a United Nations Trusteeship agreement, requiring closer international monitoring of the territory's administration. Source: Internet
During the summer of 1969, Clapton and Bramlett contributed to the Music From Free Creek "supersession" project. Source: Internet
The services were at the same time simplified and shortened, and the use of the whole Psalter every week (which had become a mere theory in the Roman Breviary, owing to its frequent supersession by saints' day services) was made a reality. Source: Internet