همین

همین

"همین" means "this very," "exactly this," or "just this" in English.

In this usage, 'همین' emphasizes that the referred object ('کتاب', the book) is precisely and exactly the one being talked about.

من همین کتاب را دیروز خریدم.

I bought this very book yesterday.

Here, 'همین که' is an expression that conveys immediacy, meaning 'as soon as'.

همین که رسیدم باران شروع شد.

As soon as I arrived, it started raining.

In this context, 'همین' is used to emphasize the immediacy of the time frame, 'right now.'

همین حالا باید بروید.

You have to go right now.