asseverative

1. (linguistics) Serving to emphasize the certainty or truth of a statement.Examples: "Further, it is strongly possible that the emphatic or asseverative lamed is etymologically distinct from the preposition, though the Masoretes do not distinguish the two."; "A prosthetic 'aleph was added in Hebrew […] and this gave a graphemic distinction between the negative and the asseverative, but the asseverative nevertheless eventually disappeared in Hebrew and other Canaanite dialects."; "Delimiting the forms which belong to the asseverative paradigm can be achieved only for some of the forms based on morphological criteria alone."