Black's Law Dictionary (2nd edition)dictionaries

Idem

Lat The same. According to Lord Coke, “idem" has two significations, se., idem syllable seu verbis, (the same in syllables or words,) and idem re et sensu, (the same in substance and in sense.) 10 Coke, 124a

Source: Black's Law Dictionary 2nd Ed (1910)