Com·plex, n.  Assemblage of related things; collection; complication.
    This parable of the wedding supper comprehends in it the whole complex of all the blessings and privileges exhibited by the gospel.   --South.
 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.

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 Con·gru·en·cy n.  Congruence.
 Congruency of lines. Geom. See Complex of lines, under Complex, n.

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