Where does “katuwiran” come from?

katuwiran (Tagalog) comes from Tagalog tuwid, from Proto-Philippine *tuqlid, from Proto-Malayo-Polynesian *tuq(ə)lid.

katuwiran (Tagalog): reason; reasoning; explanation

Definitions

  1. reason; reasoning; explanation

Ancestry of “katuwiran”, step by step

katuwiran traces back through two separate lines of ancestry.

via Tagalog tuwid

StepLanguageWordMeaning
1Tagalogtuwidstraight; not bent nor crooked as of a line, rope, etc
2Proto-Philippine*tuqlid—
3Proto-Malayo-Polynesian*tuq(ə)lid—

via Tagalog ka- -an

StepLanguageWordMeaning
1Tagalogka- -anused to form abstract nouns
2Proto-Austronesian*ka- -an—
Every word from Proto-Malayo-Polynesian *tuq(ə)lid →Every word from Proto-Philippine *tuqlid →Every word from Tagalog tuwid →