For a male cousin:
* Двоюродный брат (dvoyurodnyy brat) - This is the most common and literal translation, meaning "double-born brother."
* Кузен (kuzen) - This is a more modern and informal word, borrowed from French.
For a female cousin:
* Двоюродная сестра (dvoyurodnaya sestra) - This is the most common and literal translation, meaning "double-born sister."
* Кузина (kuzina) - This is a more modern and informal word, borrowed from French.
For a cousin of either gender:
* Двоюродный родственник (dvoyurodnyy rodstvennik) - This is a more neutral term, meaning "double-born relative."
The choice of which term to use depends on the context and level of formality.