structural:summarization, structural:reformatting
Slavic influence

Slavic influence on Romanian is especially noticeable in its vocabulary, with words of Slavic origin constituting about 10–15% of modern Romanian lexicon, and with further influences in its phonetics, morphology and syntax. The greater part of its Slavic vocabulary comes from Old Church Slavonic, which was the official written language of Wallachia and Moldavia from the 14th to the 18th century (although not understood by most people), as well as the liturgical language of the Romanian Orthodox Church. As a result, much Romanian vocabulary dealing with religion, ritual, and hierarchy is Slavic. The number of high-frequency Slavic-derived words is also believed to indicate contact or cohabitation with South Slavic tribes from around the 6th century, though it is disputed where this took place (see Origin of the Romanians). Words borrowed in this way tend to be more vernacular (compare sfârși, "to end", with săvârși, "to commit"). It has also been argued that Slavic borrowing was a key factor in the development of (î and â) as a separate phoneme.