This is the 219th most frequent Serbian word.
једно
"Једно" means "one" or "a single" in English.
Here, 'једно' indicates a numerical quantity, meaning 'one'.
Имам једно питање за вас.
I have one question for you.
In this context, 'једно' serves as a vague indicator of time, meaning 'a time' or 'once'.
Било је једно време када смо се дружили.
There was a time when we used to hang out.
Here, 'једно' refers to a singular concept or fact, implying 'one thing'.