ad limina apostolorum

ad limina apostolorum To the thresholds of the Apostles; to the highest authority. This applies to matters appropriate for papal consideration and disposition before the tombs of St. Peter and St. Paul. It is often abbreviated ad limina and is used in non-church situations to mean that a dispute must be settled by a higher authority.
Found on http://www.wordinfo.info/words/index/info/view_unit/3055/9
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