مدتی

مدتی

A period of time.

In this sentence, 'مدتی' (a while) refers to an unspecified duration of time spent in Tehran.

من مدتی در تهران زندگی کردم.

I lived in Tehran for a while.

Here, 'مدتی' (some time) indicates an indefinite period of time that passed before deciding to learn painting.

بعد از مدتی، تصمیم گرفتم نقاشی یاد بگیرم.

After some time, I decided to learn painting.

'مدتی' (a while) in this context is used to denote a period of time that has elapsed since the last meeting with the person.

مدتی است که او را ندیده‌ام.

It has been a while since I have seen him/her.