Plural: taxa.
Systematic category used in scientific, biological classification, like species or family. For example, in Diptera, the family Tipulidae is one taxon, as is the genus Tipula and the species Tipula maxima. These taxa represent different levels in a hierarchical scheme. A taxon at a certain level usually exists of more taxa at a lower level (for example, species in a genus).
Also: a taxonomic group (or unit, or entity) of any rank: a taxonomic group that is sufficiently distinct to be worthy of being distinguished by name and to be ranked in a definite category.
Also: a named phenon
taxonomic category: designates rank or level in a hierarchic classification. It is a class, the members of which are all taxa assigned to a given rank.
taxonomic species: a general expression for any taxon which has been called a species and given a specific name available under the International Code for Zoological Nomenclature.
The essential of a taxon is that it has a name so it's really quite simple. if formal.
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Also: a named phenon
taxonomic category: designates rank or level in a hierarchic classification. It is a class, the members of which are all taxa assigned to a given rank.
taxonomic species: a general expression for any taxon which has been called a species and given a specific name available under the International Code for Zoological Nomenclature.
The essential of a taxon is that it has a name so it's really quite simple.