সদরদপ্তর (Bengali) comes from Arabic صَدْر, from Classical Persian دفتر, from Arabic دَفْتَر, from Aramaic דפתרא, from Classical Syriac ܕܦܬܪܐ, from Ancient Greek διφθέρα, from Proto-Hellenic dipʰtʰérā.
সদরদপ্তর (Bengali): headquarters