This is the 683rd most frequent Persian word.
بود
"بود" means "was" or "existed."
بود is used as the simple past of 'to be', referring to the state of the book being old in the past.
این کتاب قدیم بود.
This book was old.
بود is used to indicate a hypothetical past condition in a conditional sentence.
اگر هوا آفتابی بود، بیرون میرفتیم.
If the weather was sunny, we would go outside.
بود is used in a reported speech scenario to suggest conditional provision in the past.