rapidaj

Rapidaj is the plural form of the Esperanto adjective rapida, meaning fast or rapid. It is used to describe plural nouns and forms part of the standard Esperanto system in which adjectives agree with the nouns they modify in number and definiteness.

In Esperanto, adjectives end in -a in their base form and take -j to mark plural. Therefore rapidaj accompanies plural nouns such as aviadiloj (airplanes), respondoj (answers), or rezultoj (results). Examples include rapidaj aviadiloj (fast airplanes), rapidaj respondoj (quick responses), and rapidaj rezultoj (rapid results). The form does not stand alone as a noun; it functions as a modifier that precedes or follows the noun it describes.

Rapidaj reflects a typical pattern in Esperanto where adjectives agree with nouns in number but not in gender, since Esperanto has a single grammatical gender. The use of rapidaj thus communicates a qualitative attribute—speed or rapidity—applied to items considered in the plural. Relative comparisons or intensification are expressed with other common Esperanto constructions rather than additional inflection on the adjective itself.

See also: rapida, Esperanto grammar, adjectives in Esperanto, Esperanto vocabulary.