Definition of Taxon:
A taxon (plural: taxa) is a taxonomic group or category of organisms at any level of classification. Each taxon represents a unit in the biological classification system.
Examples of taxa at different hierarchical levels:
Taxa exist at various levels of the taxonomical hierarchy. Some examples are:
• Kingdom – Animalia, Plantae
• Phylum – Chordata, Arthropoda
• Class – Mammalia, Aves
• Order – Primates, Rosales
• Family – Hominidae, Fabaceae
• Genus – Homo, Mangifera
• Species – Homo sapiens, Mangifera indica
Conclusion:
Thus, a taxon may represent any rank in the classification system, from kingdom to species.