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.

See also: Complex

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.