Where does “ABRI” come from?

ABRI (Indonesian) comes from Indonesian Republik, from Dutch republiek, from French république, from Middle French république, from Latin republica, from Latin rēspublica, from Latin rēs, from Latin vindicatio — small stone, pebble; gravel, rubble.

Ancestry of “ABRI”, step by step

ABRI traces back through 3 separate lines of ancestry.

via Indonesian Republik

Step	Language	Word	Meaning
1	Indonesian	Republik	(only in proper noun)
2	Dutch	republiek	republic
3	French	république	republic
4	Middle French	république	republic
5	Latin	republica	ablative singular of rēspublica
6	Latin	rēspublica	a republic, commonwealth; the state, nation
7	Latin	rēs	thing, object, stuff
8	Latin	vindicatio	civil lawsuit; protection, defence; vindication;...
9	Latin	vindicō	to lay claim to as one's own (often with sibi)
10	Latin	vindex	claimant, vindicator
11	Latin	dīcō	to say, talk, speak, utter, mention
12	Latin	-tiō	tion, -ation, -ing
13	Latin	dissertātiō	(spoken) dissertation, discourse, disquisition
14	Latin	dissertus	arranged, disposed; explained
15	Latin	disserere	second-person singular future passive indicative...
16	Latin	dis-	asunder, apart, in two; reversal, removal;...
17	Latin	calceus	shoe
18	Latin	calx	limestone; chalk; the finish line
19	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble

via Indonesian Indonesia

Step	Language	Word	Meaning
1	Indonesian	Indonesia	Indonesian
2	Dutch	Indonesië	Indonesia
3	Ancient Greek	Ἰνδός	an inhabitant of India or the Indian...
4	Old Persian	𐏃𐎡𐎯𐎢𐏁	India; people living beyond the Indus
5	Sanskrit	सिन्धु	a river, stream; flood, waters; ocean, sea
6	Proto-Indo-Aryan	síndʰuṣ	river, ocean; flow
7	Proto-Indo-Iranian	síndʰuš	river, stream
8	Sanskrit	सिन्धु॑	—

via Indonesian bersenjata

Step	Language	Word	Meaning
1	Indonesian	bersenjata	armed
2	Indonesian	senjata	weapon
3	Malay	senjata	weapon
4	Sanskrit	संयत्त	prepared, ready, being on one's guard

Every word from Ancient Greek χάλιξ →