1An individual person or thing; = "individual" 2.
rare Any of the entities occupying the lowest level of a system of classification; a single member of a class or species. Compare "individual".
Late Middle English; earliest use found in Guy de Chauliac's Grande Chirurgie. From classical Latin indīviduum indivisible particle, atom, in post-classical Latin also an individual, especially a member of a species, use as noun (short for indīviduum corpus indivisible body) of neuter singular of indīviduus undivided, indivisible, inseparable.