supererogation

英 [,suːpərerə'geɪʃ(ə)n; ,sjuː-] 美[,sʊpɚ,ɛrə'geʃən]

(in the Roman Catholic Church) actions believed to form a reserve fund of merit that can be drawn on by prayer in favour of sinners

（罗马天主教）赎罪行为，祈祷者为罪人行善赎罪