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Classification

Tagalog is a Central Philippine language within the Austronesian language family. Being Malayo-Polynesian, it is related to other Austronesian languages, such as Malagasy, Javanese, Indonesian, Malay, Tetum (of Timor), and Yami (of Taiwan). It is closely related to the languages spoken in the Bicol Region and the Visayas islands, such as the Bikol group and the Visayan group, including Waray-Waray, Hiligaynon and Cebuano.

Tagalog differs from its Central Philippine counterparts with its treatment of the Proto-Philippine schwa vowel *ə. In most Bikol and Visayan languages, this sound merged with /u/ and. In Tagalog, it has merged with /i/. For example, Proto-Philippine *dəkət (adhere, stick) is Tagalog dikít and Visayan & Bikol dukót.

Proto-Philippine *r, *j, and *z merged with /d/ but is /l/ between vowels. Proto-Philippine *ŋajan (name) and *hajək (kiss) became Tagalog ngalan and halík. Adjacent to an affix, however, it becomes /r/ instead: bayád (paid) → bayaran (to pay).

Proto-Philippine *R merged with /ɡ/. *tubiR (water) and *zuRuʔ (blood) became Tagalog tubig and dugô.