da.

Borrowed from Bulgarian да (da). First attested in the 1810s in the poems of Iancu Văcărescu, having entered the language from the common speech of Muntenia and spreading to other regions starting in the 1860s. Before, Romanian used echo answers or a variety of affirmative adverbs including așa, adevărat or bine. da does not feature in Aromanian, Megleno-Romanian and Istro-Romanian. An alternative and broadly controversial theory argues that the term is derived from the Latin ita ("thus", "so" or "yes"), possibly being further influenced by the common Slavic da ("yes") from the surrounding Slavic languages before reaching its present state (see Sprachbund). See also dacă, which according to this theory derives from ita quod. In some regions, ta is used repeatedly to indicate impatience with someone talking too much or aimlessly, although this is more likely onomatopoetic in origin.

From Latin dare, ultimately from Proto-Italic *didō, from Proto-Indo-European *dédeh₃ti, from the root *deh₃- (“give”). Compare Aromanian dau, dari, Italian dare, Spanish dar.