Every report in Google Analytics is made up of dimensions and metrics.
Dimensions describe characteristics of your users, their sessions and actions. The dimension City describes a characteristic of sessions and indicates the city, for example, “Paris” or “New York”, from which each session originated. The dimension Page describes a characteristic of page view actions and indicates the URL of each page that was viewed.
How to differentiate Dimensions from Metrics?
In 99% of the cases, a Dimension is a text field, while a Metric is represented by a number.
List of all Dimensions available in Google Analytics
If you want to see a list of all available Google Analytics Dimensions, select “Dimension” as a category in our Glossary: