What is the meaning of the word "smooth"?

Definitions:

(music) without breaks between notes adjective
- smooth and connected
free from obstructions verb
- smooth the way towards peace negotiations
having a surface free from roughness or bumps or ridges or irregularities adjective
- smooth skin
lacking obstructions or difficulties adjective
- the bill's path through the legislature was smooth and orderly
make smooth or smoother, as if by rubbing verb
- smooth the surface of the wood
of motion that runs or flows or proceeds without jolts or turbulence adjective
- a smooth ride
smooth and unconstrained in movement adjective
- a long, smooth stride
the act of smoothing noun
- They gave their hair a quick smooth.