solitus

Solitus is a Latin adjective meaning "accustomed, habitual, usual." It derives from the verb solere, "to be accustomed." The masculine nominative singular form is solitus; the feminine is solita and the neuter solitum. The word also exists as the perfect passive participle of solere, used in Latin to mean "having been accustomed" or "used to." In classical Latin, solitus can function both adjectivally and substantively, and it appears in various phrases describing customary actions or states.

In scientific nomenclature, solitus may be used as a species epithet. As a standard Latin adjective, it agrees in gender with a genus name and conveys a sense of habitual or typical characteristics of the form. For example, a genus with masculine gender could take a species name solitus to denote habitual traits, though actual usage depends on the author and the genus.

Outside biology, solitus appears in Latin prose and scholastic texts to indicate what is customary or established by habit. In English translations, the term is usually rendered as "accustomed" or "habitual," rather than used directly as a common English word.