Tertiaries (from the Latin "tertiarius", relative to "third"), or what are known as "Third Orders", are those persons who live according to the Third Rule of religious orders, either in a religious community or outside of a monastery in the world. The idea which forms the basis of this institute is in general that persons who on account of certain circumstances cannot enter a religious order, strictly so-called, may, nevertheless, as far as possible enjoy the advantages and privileges of religious orders.