The Generalization toolset contains tools for dissolving or eliminating features.
Additional generalization tools are available in the Generalization toolset in the Cartography toolbox.
Aggregates features based on specified attributes.
Eliminates polygons by merging them with neighboring polygons that have the largest area or the longest shared border. Eliminate is often used to remove small sliver polygons that are the result of overlay operations, such as those performed by Intersect and Union tools.
Creates a new output feature class containing the features from the input polygons with some parts or holes of a specified size deleted.