This is the 28th most frequent Ukrainian word.
чи
The Ukrainian word "чи" is a particle meaning "or" or used to introduce yes-no questions.
Here, 'чи' is used as an interrogative particle, equivalent to 'whether' or 'if' in English.
Чи ти був у Львові?
Have you been to Lviv?
In this sentence, 'чи' introduces an indirect question or condition, similar to 'if' or 'whether' in English.
Я не знаю, чи вона прийде.
I don't know if she will come.
Here, 'чи' serves as an initiating particle for a polite or formal question.