how do you do ?
the terms "diluted" and "concenterated" are relative terms
they may have exact meaning "concenteration", for example conc. sulphuric-by covention-means 98% concentration and so on.
you -by mentioning the term "saturated" see confused ,as saturation is condion in which the solution cantain maximum amount of solute which may -in some cases - spairingly soluble electrolyte and here it follow the law of mass action
you may consult the following referances:
1.Vogel quantitative analytical chemistry,Longman Publishars.
2-Alexyev quantitative analytical chemistry,Mir Publishars.