Dictionary

Definitions from Webster's International:

Complex
complex, noun. A more or less complicated collection or system of related things or parts.
System
system, noun. A set or arrangement of things so related or connected as to form a unity or organic whole.
Network
network, noun. Any arrangement or fabric of parallel wires, threads, etc. crossed by others fastened to them so as to leave open spaces.: complex, noun. A more or less complicated collection or system of related things or parts.
System
system, noun. A set or arrangement of things so related or connected as to form a unity or organic whole.
Network
network, noun. Any arrangement or fabric of parallel wires, threads, etc. crossed by others fastened to them so as to leave open spaces.: system, noun. A set or arrangement of things so related or connected as to form a unity or organic whole.
Network
network, noun. Any arrangement or fabric of parallel wires, threads, etc. crossed by others fastened to them so as to leave open spaces.: network, noun. Any arrangement or fabric of parallel wires, threads, etc. crossed by others fastened to them so as to leave open spaces.

Complex
complex, adj. Composed of two or more related parts, composite, not simple.: complex, adj. Composed of two or more related parts, composite, not simple.

Notes

"complex system" is legit, thus also, "complex network" and also "complex complex".
"network" is less general than "complex" or "system"
"complex" is confusing, as might be either noun or adjective
hence, "system" is reccomended

Revised 25 June 2002 by Ralph Abraham, <abraham@vismath.org>