What is the best way to describe a term that means to make something more concentrated by removing parts?

The most accurate term for making something more concentrated by removing parts is to "condense." This word specifically refers to the action of reducing the volume or amount of something by removing less essential elements, thereby intensifying what remains. Condensing is commonly used in various contexts, such as in science to refer to the process of creating a denser form of a substance by removing components like vapor from air or liquid.

While "summarize," "abridge," and "epitomize" also involve some form of reduction, they typically refer more to verbal communication or written content. Summarizing focuses on providing a brief overview of essential points of a text without necessarily concentrating on the substance itself. Abridging involves cutting down a larger work but does not inherently imply an increase in concentration or intensity. Epitomizing is about representing a larger idea or category in a typical or exemplary manner, which again does not imply concentration in the same sense as condensing does. Thus, the best term to describe the process of making something more concentrated by removing parts is indeed "condense."