Key

Definition

A published set of statements or questions used to identify species or other taxa by choosing between alternative characters.

Etymology

Derived from the Old English 'cǣg' and Old Norse 'kē', meaning 'instrument for opening locks', later extended to other contexts involving selection or differentiation.

Example

Using the dichotomous key, the entomologist was able to identify the species of the unknown beetle.

Synonyms

• Identification guide

Related Terms

• Dichotomous key
• Taxonomic key
• Identification
• Classification

Usage Notes

Keys are essential tools in taxonomy and can be simple or complex, including various types such as dichotomous or polytomous keys.