When more solvent is added to a solution to decrease it's concentration the action is known as dilution.
This is known as the concentration or more technically the molarity or molality of the solution.
It is a solvent that dissolves in a solution.
The substance that is dissolved in a solution is a solute. A solvent is the dissolving medium in a solution.
Your question is a little ambiguous. However, in general, there is normality, molality and molarity which each describe the concentration of a solute into a solvent. The fraction of moles of solute to solvent could correctly be termed the "molar fraction" or, "molal fraction" depending on whether the solvent is expressed in volume or weight respectively. By contrast, normality is based on the chemical functionality of the solute, for example a 1M solution of sulfuric acid would be about a 2N solution of acid.
It may be called concentration.
A solution with the same ratio of solute to solvent (concentration) as another solution is called isotonic. If it has more solvent and thus a lower solute concentration, then it is called hypertonic.
The term for "the amount of solute dissolved in a given volume of solution" is "concentration"
A dilute solution is a solution in which there is a small amount of solute (the thing that gets dissolved) compared to the total amount of possible solute that can be dissolved in the solvent (the thing that does the dissolving). A concentrated solution is when there is a lot or all solute that can possibly fit in the solvent.
It is a solvent that dissolves in a solution.
This is known as the concentration or more technically the molarity or molality of the solution.
The substance that is dissolved in a solution is a solute. A solvent is the dissolving medium in a solution.
A solution that has only a little solute is called a dilute solution. In a dilute solution, the concentration of the solute is low compared to the solvent. The amount of solute in the solution is relatively small.
Substance which is going to dissolve in medium is called solute and the medium is called solvent. solute + solvent = solution
The solution has a lower concentration. We can also say that it is dilute. Concentration is the amount of solute over the volume of solvent, thus when a large amount of solvent is used, concentration of the solution is low.
The water in a solution is called the solvent
Your question is a little ambiguous. However, in general, there is normality, molality and molarity which each describe the concentration of a solute into a solvent. The fraction of moles of solute to solvent could correctly be termed the "molar fraction" or, "molal fraction" depending on whether the solvent is expressed in volume or weight respectively. By contrast, normality is based on the chemical functionality of the solute, for example a 1M solution of sulfuric acid would be about a 2N solution of acid.
The water in a solution is called the solvent