O

Occupation / Job: شغل

Of / Out of / From: از

Of course: البته / حتماً

Off: خاموش

Often / Mostly / Mainly / Usually: اغلب

Oil / Petroleum: نفت

Old (objects) / Worn out: کهنه

Old (people): پیر

Old woman: پیرزن

On: روشن / روی

On Sundays: یکشنبه ها

Once a week: یک روز در هفته

One (person): کس

One / Human / Man / Person: آدم

Only: فقط / تنها

Open: باز

To open: باز کردن

Opener: بازکن

Opinion: نظر

Opposite (geographical): روبرو

Opposite (literal): مسافرت

Optimist: خوشبین

Or: یا

Orange (colour): نارنجی

Orange (fruit): پرتقال

Order / Sequence: ترتیب

To order / To command: < فرمودن < فرما

Orientalist: شرقشناس

Ought / Should / Must: باید

Out / Outside: بیرون

Out / Outside / Abroad: خارج

Out of / Of / From: از

Out of order / Broken / Faulty / Damaged / Destroyed: خراب

Outside / Out: بیرون

Outside / Out / Abroad: خارج

Own / Self: خود