This is the 547th most frequent Estonian word.
teisi
The Estonian word "teisi" means "others" or "other people" in English.
Here, 'teistele' is the allative case of 'teised,' indicating direction or giving to others.
Aitasime teistele inimestele, kes olid hädas.
We helped other people who were in trouble.
The word 'teisi' here is used as a plural form in the partitive case referring to other cultures and customs.
Ma lugesin täna raamatuid, et õppida teisi kultuure ja komme.
I read books today to learn about other cultures and customs.
In this case, 'teise' is the singular form in the allative case referring to another teacher.