What is the meaning of the word "grey"?

Definitions:

any organization or party whose uniforms or badges are grey noun
- the Confederate army was a vast grey
clothing that is a grey color noun
- We was dressed in grey.
intermediate in character or position adjective
- a grey area between clearly legal and strictly illegal
make grey verb
- The painter decided to grey the sky
of an achromatic color of any lightness intermediate between the extremes of white and black adjective
- the little grey cells
to turn grey verb
- Their hair began to grey.
used to signify the Confederate forces in the American Civil War (who wore grey uniforms) adjective
- a stalwart grey figure