What is Comparative?

Legal Definition
In linguistics, the comparative is a syntactic construction that serves to express a comparison between two (or more) entities or groups of entities in quality, quantity, or degree. See comparison (grammar) for an overview of comparison, as well as positive and superlative degrees of comparison.

The syntax of comparative constructions is poorly understood due to the complexity of the data. In particular, the comparative frequently occurs with independent mechanisms of syntax such as coordination and forms of ellipsis (gapping, pseudogapping, null complement anaphora, stripping, verb phrase ellipsis). The interaction of the various mechanisms complicates the analysis.
-- Wikipedia
Legal Definition
Proceeding by the method of comparison; founded on comparison; estimated by comparison.
See also
-- Black's Law Dictionary