linguistic:voice_change, structural:reformatting, quality:corruption
Vocabulary and borrowed words

Tagalog vocabulary is mostly of native Austronesian or Tagalog origin, such as most of the words that end with the diphthong -iw, (e.g. giliw) and words that exhibit reduplication (e.g. halo-halo, patpat, etc.). Besides inherited cognates, this also accounts for innovations in Tagalog vocabulary, especially traditional ones within its dialects. Tagalog has also incorporated many Spanish and English loanwords; the necessity of which increases in more technical parlance.

In precolonial times, Trade Malay was widely known and spoken throughout Maritime Southeast Asia, contributing a significant number of Malay vocabulary into the Tagalog language. Malay loanwords, identifiable or not, may often already be considered native as these have existed in the language before colonisation.

Tagalog also includes loanwords from Indian languages (Sanskrit and Tamil, mostly through Malay), Chinese languages (mostly Hokkien, followed by Cantonese, Mandarin, etc.), Japanese, Arabic and Persian.

English has borrowed some words from Tagalog, such as abaca, barong, balisong, boondocks, jeepney, Manila hemp, pancit, ylang-ylang, and yaya. Some of these loanwords are more often used in Philippine English.

Tagalog has contributed several words to Philippine Spanish, like barangay (from balan͠gay, meaning barrio), the abacá, cogon, palay, dalaga etc.