declarative (adj.)

1530s, "making clear or manifest, explanatory," from French déclaratif and directly from Late Latin declarativus, from past-participle stem of Latin declarare "make clear, reveal, disclose, announce," from de-, here perhaps an intensive prefix (see de-) + clarare "clarify," from clarus "clear" (see clear (adj.)).

Meaning "making declaration, exhibiting" is from 1620s. The word was used in mid-15c. as a noun meaning "an explanation." Related: Declaratively.

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Definitions of declarative from WordNet
declarative (adj.)
relating to the use of or having the nature of a declaration;
Synonyms: declaratory / asserting
declarative (adj.)
relating to the mood of verbs that is used simple in declarative statements;
Synonyms: indicative
declarative (n.)
a mood (grammatically unmarked) that represents the act or state as an objective fact;
Synonyms: indicative mood / indicative / declarative mood / common mood / fact mood