سوم

سوم

"سوم" translates to "third" in English.

Here, 'سوم' (the third) is being used as an ordinal number to indicate the sequence of the book.

این کتاب سوم است که من امروز تمام کردم.

This is the third book I finished today.

In this case, 'سومین' (the third) modifies the noun 'روز' (day) to designate a specific day by its order in the week.

سومین روز هفته برای من همیشه شلوغ است.

The third day of the week is always busy for me.

'سوم' is used here as an ordinal number specified in date contexts to indicate the day of the month.

در سوم ماه جشن تولد من است.

On the third of the month is my birthday party.