complement
I
noun
companion. complementum, completion, congener, coordinate, correlate, correspondent, corresponding part, counterpart, pendant, reciprocal, remainder, rest, supplement
II
index
addendum, addition, adjunct, allonge, appendix (accession), boom (increase), codicil, component, content (structure), corollary, correlate, correspond (be equivalent), rider, staff, supplement
Burton's Legal Thesaurus.
William C. Burton.
2006