aastase

Aastase is the genitive singular form of the Estonian adjective aastane, which means annual or yearly. In Estonian, adjectives agree with the nouns they modify in number, case, and gender; aastane takes the form aastase when the modified noun is in the genitive singular. This is a grammatical inflection rather than a standalone word with a lexical meaning beyond “annual.”

Etymology and form: aastane is derived from the noun aasta, meaning year, with the adjectival suffix -ne. The genitive singular endpoint -se marks its agreement with a noun in the genitive case. Other case and number forms of the adjective have their own endings, as with other Estonian adjectives.

Usage: Aastase functions as a descriptor indicating a relation to a year. It is used in written and formal Estonian to express annual attributes, durations, or frequencies when the modified noun appears in the genitive singular. Because it is an inflected form, it appears within a larger grammatical structure rather than as an isolated lexical unit.

Relation to other forms: The base form is aastane (nominative singular). Aastase is specifically the genitive singular form; other cases and numbers have their respective endings, as is typical for Estonian adjectives.

See also: aasta, aastane.