One of the service-books of the Roman Catholic Church, used by
bishops and other dignitaries. So called from the first words of the
canon, “Te igitur, clementissime Pater.”
Oaths upon the Te Igitur.
Oaths sworn on the Te Igitur service-book, regarded as
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
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