Syntactic gemination

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Syntactic gemination, or syntactic doubling, is an external sandhi phenomenon in Italian, other Romance languages spoken in Italy, and Finnish. It consists in the lengthening (gemination) of the initial consonant in certain contexts. It may also be called word-initial gemination or phonosyntactic consonantal gemination.

In Italian it is called raddoppiamento sintattico (RS), raddoppiamento fonosintattico (RF), raddoppiamento iniziale, or rafforzamento iniziale (della consonante).