1175-1225; (adj.) Middle English < Old French < Late Latinsimplus simple, Latin (in simpla pecunia simple fee or sum), equivalent to sim- one (see simplex) + -plus, as in duplusduple, double (see -fold); cognate with Greekháplos (see haplo-); (noun) Middle English: commoner, derivative of the adj.
early 13c., "humble, ignorant," from O.Fr. simple, from L. simplus "single," variant of simplex (see simplex). Sense evolved to "lowly, common" (late 13c.), then "mere, pure" (c.1300). As opposite of composite it dates from 1425; as opposite of complicated it dates from c.1555. Disparaging sense (mid-14c.) is from notion of "devoid of duplicity." Simply (adv.) in purely intensive sense is attested from 1590.
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
simple in Technology
1. Early system on Datatron 200 series. Listed in CACM 2(5):16 (May 1959). 2. Simulation of Industrial Management Problems with Lots of Equations. R.K. Bennett, 1958. Predecessor to DYNAMO, for IBM 704.