What is the meaning of the word "solid"?

Definitions:

acting together as a single undiversified whole adjective
- a solid voting bloc
characterized by good substantial quality adjective
- solid comfort
entirely of one substance with no holes inside adjective
- a solid block of wood
financially sound adjective
- the bank is solid and will survive this attack
having three dimensions adjective
- a solid object
impenetrable for the eye adjective
- solid blackness
of a substantial character and not frivolous or superficial adjective
- work of solid scholarship
of good quality and condition adjective
- solidly built
of one substance or character throughout adjective
- solid gold
of the same color throughout adjective
- solid color