sim·plic·i·ty   [sim-plis-i-tee]
–noun,plural-ties.

1. the state, quality, or an instance of being simple.
2. freedom from complexity, intricacy, or division into parts: an organism of great simplicity.
3. absence of luxury, pretentiousness, ornament, etc.; plainness: a life of simplicity.
4. freedom from deceit or guile; sincerity; artlessness; naturalness: a simplicity of manner.

Origin: 1325–75; ME simplicite (< OF simplicité) < L simplicitās simpleness, equiv. to simplici- (s. of simplex) simplex + -tās -ty2