simpleness,
simplicity the quality of being simple or uncompounded; "the simplicity of a crystal"
simple unornamented; "a simple country schoolhouse"; "her black dress--simple to austerity"
complex complicated in structure; consisting of interconnected parts; "a complex set of variations based on a simple folk melody"; "a complex mass of diverse laws and customs"
quality an essential and distinguishing attribute of something or someone; "the quality of mercy is not strained"--Shakespeare
complexity -
That which is and renders complex; intricacy; complication.
Wikipedia
In general usage, complexity tends to be used to characterize something with many parts in intricate arrangement. The study of these complex linkages is the main goal of network theory and network science. In science there are at this time a number of approaches to characterizing complexity, many of which are reflected in this article.
OmegaWiki Dictionary
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complexity The intrinsic minimum amount of resources, for instance, memory, time, messages, etc., needed to solve a problem or execute an algorithm.\n(source: NIST)
