composed of only one substance or element: a simple substance.
b.
not mixed.
18.
Botany. not divided into parts: a simple leaf; a simple stem.
19.
Zoology. not compound: a simple ascidian.
20.
Music.uncompounded or without overtones; single: simple tone.
21.
Grammar. having only the head without modifying elements included: The simple subject of “The dappled pony gazed over the fence” is “pony.” Compare complete( def 5 ).
22.
(of a verb tense) consisting of a main verb with no auxiliaries, as takes (simple present) or stood (simple past) ( opposed to compound ).
Origin: 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.
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.