Where does “abantailatsu” come from?

abantailatsu (Basque) comes from Basque abantaila, from Spanish ventaja, from French avantage, from Old French avantage, from Old French avant, from Latin ab ante, from Latin ante, from Ancient Greek κλίσις — Derives abstract/action nouns from verb roots.

abantailatsu (Basque): advantageous

Definitions

advantageous

Ancestry of “abantailatsu”, step by step

Step	Language	Word	Meaning
1	Basque	abantaila	advantage
2	Spanish	ventaja	advantage, upper hand, edge; benefit; head start
3	French	avantage	advantage
4	Old French	avantage	advantage; profit; gain
5	Old French	avant	beforehand; earlier
6	Latin	ab ante	in front, before
7	Latin	ante	before, in front, forwards; before; before,...
8	Ancient Greek	κλίσις	bending, inclination; a lying down; a place for...
9	Ancient Greek	-σῐς	"suffix forming nouns"
10	Ancient Greek	-τις	retained after dentals
11	Proto-Indo-European	-tis	Derives abstract/action nouns from verb roots

Every word from Proto-Indo-European -tis →Every word from Ancient Greek -σῐς →Every word from Ancient Greek κλίσις →