fundamentaj

Fundamentaj is the plural form of the Esperanto adjective fundamenta, meaning fundamental, foundational, or basic. It is used to describe plural nouns, as in fundamentaj ideoj (fundamental ideas) or fundamentaj principoj (fundamental principles). In Esperanto, adjectives agree with the nouns they modify in number and do not have gender; the singular form is fundamenta and the plural form is fundamentaj.

The word is built from the root fundament- (foundation) plus the adjectival suffix -a to form fundamenta, with the plural suffix -j to yield fundamentaj. This pattern is standard for adjectives describing plural nouns.

In typical usage, fundamentaj denotes essential or core characteristics within a discussion of theory, science, philosophy, or pedagogy. It can modify a wide range of nouns such as principoj, konstitucioj, ideoj, or celoj. The sense is pragmatic, signaling that something is a basic building block or indispensable element of a system or argument.

When capitalized as Fundamentaj, it may appear as a proper noun or the name of a project, publication, or organization. In such cases it is treated as a brand or title rather than a general lexical form, and its meaning is defined by the entity using it.

See also fundamenta, ideoj, principoj, Esperanto grammar.