-asyon

• -syon, -siyon – following consonants

Borrowed from Spanish -ación.

• IPA^(key): /ʔasˈjon/, [ʔɐˈʃon]

-asyón

1. Used in forming a noun to represent a property corresponding to a verb, usually Spanish-derived. Also used to replace English -ation in words adapted directly to Tagalog upon borrowing: -ation

• Almost all Tagalog words with the ending are borrowed from Spanish, with some being pseudo-Hispanic adaptations of English borrowings ending with -ation to match existing Spanish loanwords with that suffix (e.g. populasyón, from population; polusyón from pollution). Compare the usage of Indonesian -asi (from Dutch -atie) to replace -ation in some English borrowings in a similar vein to harmonize with existing Dutch borrowings ending with that suffix.
• Rarely used to form authentic words (compared to the synonymous native equivalent pag-), except for surface analysis of existing words (e.g. modernisásyon), which can be analyzed as modernisá+-asyon, or as replacement of English -ation as explained above.

• pag-

• Category Tagalog terms suffixed with -asyon not found

• “-asyon”, in Pambansang Diksiyonaryo | Diksiyonaryo.ph, Manila: Komisyon sa Wikang Filipino, 2018