Where does “tles” come from?

tles (Ladin) comes from Ladin te, from Latin intus, from Latin în, from Latin en, from Proto-Italic en, from Proto-Indo-European h₁én — in.

tles (Ladin): in the, into the (feminine plural)

Definitions

tles traces back through two separate lines of ancestry.

Step	Language	Word	Meaning
1	Ladin	te	in, into
2	Latin	intus	within, inside; at home
3	Latin	în	in, at, on, upon, from (space)
4	Latin	en	lookǃ beholdǃ; reallyǃ?; come onǃ
5	Proto-Italic	en	in
6	Proto-Indo-European	h₁én	in

Step	Language	Word	Meaning
1	Ladin	les	the
2	Latin	illās	—