A taxon (plural: taxa) is a group of organisms decided to be a unit, usually given a name and rank.

Taxon / Taxa

The level of a taxon in a taxonomic hierarchy, meaning the level of specificity the taxon is defined with relative to other taxons.

Taxonomic rank

The arrangement of taxonomic ranks into "higher" and "lower" levels according to level of specificity.

Taxonomic hierarchy

- Taxa
- Taxonomic Rank
- Taxonomic hierarchy

Georgetown University

The study of identifying and grouping organisms to reconstruct the evolutionary histories of organisms.

Taxonomy in Biology

Wikipedia

- The study of the evolutionary history of a certain group of organisms, utilizes taxonomy to show relationships 
- Often represented as a family tree to show which species "yielded" later ones

Phylogeny

Components of a biological taxonomy

From largest/most general to smallest/most specific:

- domain
- kingdom 
- phylum (in zoology) / division (in botany)	
- class 
- order
- family
- genus
- species

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