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Definition of Sample size

Sample size Definition from Business & Finance Dictionaries & Glossaries
eng-iso
[n] The number of units in a sample.
Sample size Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
Sample size determination is the act of choosing the number of observations or  replicates to include in a statistical sample. The sample size is an important feature of any empirical study in which the goal is to make inferences about a population from a sample. In practice, the sample size used in a study is determined based on the expense of data collection, and the need to have sufficient statistical power. In complicated studies there may be several different sample sizes involved in the study: for example, in a survey sampling involving stratified sampling there would be different sample sizes for each population. In a census, data are collected on the entire population, hence the sample size is equal to the population size. In experimental design, where a study may be divided into different treatment groups, there may be different sample sizes for each group.

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Sample size Definition from Society & Culture Dictionaries & Glossaries
Environmental Engineering (English ver.)
(Statistics) The number of individual observations. The sample size, i.e., number of observations about a particular event or phenomenon, has important implications on how representative the sample is of the Population.