Definitions for "Dilutions"
Where dilutions are given for making up liquid reagents, they are expressed as, for example, 1 in 4 or 1/4, meaning one part added to three parts, i.e. a 25% solution of A in B.. v/v - This is volume to volume (two liquids).. w/v - This is weight to volume (solid added to a liquid)..
To mix sample with water, saline, or buffer to decrease the concentration.