This is the 535th most frequent Ukrainian word.
the
The word "the" does not exist in Ukrainian; it is a definite article in English, which Ukrainian lacks.
In this sentence, 'the' is used to specify a particular day or year.
Це найкращий день у році.
This is the best day of the year.
Here, 'the' is used to refer to a specific book already mentioned or known by context.
Ми прочитали книгу за цей тиждень.
We read the book during this week.
In this statement, 'the' denotes particular places familiar to the speaker and listener.