Taxonomy
A system for organizing and naming living things based on shared characteristics, from broad groups down to individual species.
A hierarchical classification system used to organize and name organisms based on evolutionary relationships and shared traits. Developed formally by Carl Linnaeus in the 18th century, it arranges life into nested categories—kingdom, phylum, class, order, family, genus, and species—allowing scientists to identify, describe, and study biodiversity systematically.
What this means in real life
A grocery store uses a taxonomy: produce section contains vegetables, which contains leafy greens, which contains spinach. Each level narrows down what you're looking for, making items easier to find and compare.
What it isn’t
It's not simply a list or alphabetical index. A taxonomy must show hierarchical relationships—how categories nest inside larger ones—whereas a list treats items as equal. A phone book is a list; a taxonomy explains how things relate.
Commonly misused online
People often use 'taxonomy' to mean any categorization system, even flat ones without hierarchy. On social media, 'taxonomy of memes' or 'taxonomy of tweets' often just means 'types of' rather than a true ranked classification structure.