Webster's English Dictionary

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quaternary

1. qua.ter.na.ry \'kwa:t-*(r)-.ner-e-, kw*-'t*r-n*-re-\ aj [L quaternarius, 
   fr. quaterni four each] 1: of, relating to, or consisting of four units or 
   members : QUADRUPL E cap  2: of, relating to, or being the geological 
   period from the end of the Ter tiary to the present time or the 
   corresponding system of rocks 3: consisting of, containing, or being an 
   atom united by four bonds to car bon atoms
2. quaternary n 1: a member of a group fourth in order or rank  cap  2: the 
   Quaternary period or system of rocks