"The process of making a liquid stronger or purer by heating it until it changes to a gas and then cooling it so that it changes back into a liquid, or a liquid made by this process." (CD)
See also: https://dictionary.cambridge.org/us/dictionary/english/distillation?q=distillations
The graph displays the other subjects mentioned on the same pages as the subject "Distillation". If the same subject occurs on a page with "Distillation" more than once, it appears closer to "Distillation" on the graph, and is colored in a darker shade. The closer a subject is to the center, the more "related" the subjects are.