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Definition

noun, singular or plural: species

(taxonomy)

(1) The lowest taxonomic rank, and the most basic unit or category of biological classification.

(2) An individual belonging to a group of organisms (or the entire group itself) having common characteristics and (usually) are capable of mating with one another.

Supplement

A species is given a two-part name: the generic name and the specific name (or specific epithet). For example, Allium cepa (commonly known as onion)

Word origin: Middle English, logical classification, from Latin speciēs, a seeing, kind, form.

Related phrases: endangered species, dominant species, pioneer species, species specificity, rare species, exotic species, early seral species, type species, species area curve.