Mole Concept: Are there any other ways of finding the concentration of stuff besides those i've stated below?

Question

- Concentration(g/cm^3)=Mass of substance /Volume

- concentration (mol/dm^3)= No. of Moles/ Volume

- Concentration(mol/dm^3)= Concentration(g/dm^3)/ relative molecular mass of substance

Answer 1

Mol fraction (mols A / mols B)

Answer 2

There is a molal solution - abreviation is  m  . This is defined as 1 molar mass of the solute dissolved in 1 kg of solvent. Contrast this with the molar solution, abreviation M which is 1 molar mass of solute in 1 dm³ of solution.