The Collaborative International Dictionary of English v.0.48:

Complex \Com"plex\, n. [L. complexus]
   Assemblage of related things; collection; complication.
   [1913 Webster]

         This parable of the wedding supper comprehends in it
         the whole complex of all the blessings and privileges
         exhibited by the gospel.                 --South.
   [1913 Webster]

   Complex of lines (Geom.), all the possible straight lines
      in space being considered, the entire system of lines
      which satisfy a single relation constitute a complex; as,
      all the lines which meet a given curve make up a complex.
      The lines which satisfy two relations constitute a
      congruency of lines; as, the entire system of lines, each
      one of which meets two given surfaces, is a congruency.
      [1913 Webster]