Where does “kemengertian” come from?

kemengertian (Indonesian) comes from Indonesian mengerti, from Indonesian meng-, from Malay meng-, from Proto-Malayic *mAN-, from Proto-Malayo-Chamic *maN-, from Proto-Malayo-Sumbawan *maN-, from Proto-Malayo-Polynesian *maN- — inflectional prefix marking actor voice.

Ancestry of “kemengertian”, step by step

kemengertian traces back through two separate lines of ancestry.

via Indonesian mengerti

StepLanguageWordMeaning
1Indonesianmengerti
2Indonesianmeng-agent focus, frequently but erroneously called...
3Malaymeng-agent focus, frequently but erroneously called...
4Proto-Malayic*mAN-
5Proto-Malayo-Chamic*maN-
6Proto-Malayo-Sumbawan*maN-
7Proto-Malayo-Polynesian*maN-inflectional prefix marking actor voice

via Indonesian ke- -an

StepLanguageWordMeaning
1Indonesianke- -anness; appended to adjectives to form nouns meaning "the state of (the adjective)", "the quality of (the adjective)", or "the measure of (the adjective)"
2Malayke- -anness; appended to adjectives to form nouns meaning "the state of (the adjective)", "the quality of (the adjective)", or "the measure of (the adjective)"
3Proto-Malayic*kə- -an
4Proto-Austronesian*ka- -an
Every word from Proto-Malayo-Polynesian *maN-Every word from Indonesian meng-Every word from Malay meng-