What is the meaning of Declarative?

Serving to declare; having the quality of a declaration.

Expressing truth.

That declares a construct.

A way of programming that is most akin to just stating what is wanted, rather than having to describe how to do it. w:Declarative programming

Synonym of declaration (declarative statement)

(Ithkuil linguistics) Illocution: a “performative” statement which. by its utterance/publication, creates a change of state (at least psychologically) for the addressees (i.e., a declaration, announcement, edict, etc.)

Source: wiktionary.org