0 the activity of providing or trying a small amount of a product so someone can decide whether to buy it: --
When it works, sampling can be the most effective form of advertising.
1 the activity of getting the opinions of a number of people chosen from a group, in order to find out about the whole group: --
2 the activity of testing a small amount of something to see whether it is good, whether it contains a particular substance, etc.: --
3 a small amount, number, or part of something that is tried or tested: --