What's the difference between quindecemvir and sacerdotal?

Quindecemvir

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Definition:

• (n.) One of a sacerdotal college of fifteen men whose chief duty was to take care of the Sibylline books.

Example Sentences:

Sacerdotal

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Definition:

• (a.) Of or pertaining to priests, or to the order of priests; relating to the priesthood; priesty; as, sacerdotal dignity; sacerdotal functions.

Example Sentences:

• (1) ", Alberto Alesina, Edward Glaeser and Bruce Sacerdote argue that the answer is that too many people at the bottom of the pile in the US are black or Hispanic.
• (2) Or alternatively, as in "Josephine the Singer", music is cited as the essence of a particular kind of religious impulse: one that links the congregation with the sacerdotal through the agency of song.