Definition of "declarative"

declarative

/dɪˈklæɹətɪv/

adjective
not comparable
1. Serving to declare; having the quality of a declaration.
2. (grammar, of a verb, sentence, or mood) Expressing truth.
  Quotations
  Palmer (1986:26–28) suggested that all languages have a clear way of indicating that the speaker is making a statement which (s)he believes to be true. Such statements are usually expressed by the declarative grammatical structure and the respective mood is called either "declarative" or "indicative"...
  2016, Irina Nikolaeva, “Analyses of the semantics of mood”, in Jan Nuyts, Johan van der Auwera, editors, The Oxford Handbook of Modality and Mood, Oxford: Oxford University Press, page 69
3. (programming) That declares a construct.
4. (programming) 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
noun
plural declaratives
1. Synonym of declaration (declarative statement)