Order

Definition

A rank in the biological classification system that is higher than family and lower than class, used to organize and categorize organisms. In entomology and arachnology, orders are used to group insects and arachnids that share common characteristics.

Etymology

Derived from the Latin word 'ordo,' meaning 'row, series, or arrangement,' and used in scientific contexts to denote a level of taxonomy.

Example

The order Lepidoptera includes butterflies and moths.

Related Terms

• Class
• family
• Genus
• Species
• Taxonomy

Usage Notes

Taxonomic ranks are hierarchical, and the use of 'order' helps scientists organize and classify the vast diversity of life. In entomology, familiar orders include Coleoptera (beetles), Diptera (flies), and Hymenoptera (ants, bees, wasps).