عدد

What it means

عدد (adad) is an Arabic loanword that does double duty in Persian. As a noun, it means “number” in the abstract sense: a numerical value, a digit, a figure. As a classifier, it functions like English “piece” or “unit” and pairs with a numeral to count discrete objects: سه عدد کتاب (se adad ketâb, three units of book = three books). The word comes from the Arabic root ع-د-د (a-d-d, to count), the same root that gives Persian تعداد (te’dâd, quantity), معدود (ma’dud, limited in number), and عدد (adad) itself.

As a noun

In its noun use, عدد names a number as an entity. عدد فرد (adad-e fard) is an odd number. عدد زوج (adad-e zoj) is an even number. عدد اول (adad-e avval) is a prime number. The word shows up in mathematics, statistics, formal writing, and any context where you need to refer to a number as such, abstracted from what it counts. In modern Persian schooling, all the math vocabulary is built on عدد and its derivatives.

As a classifier

The classifier use is the more practically important one for learners. Persian uses classifiers between numerals and nouns the way English does for some categories (“three sheets of paper,” “two heads of cattle”). The default classifier in colloquial Persian is تا (tâ): دو تا کتاب (do tâ ketâb, two books). عدد is the more formal, more written, more bureaucratic alternative: دو عدد کتاب (do adad-e ketâb, two units of book). The two are interchangeable in meaning but not in register. تا belongs to spoken Persian; عدد belongs to formal speech, written documents, inventory lists, and bureaucratic Persian.

Iranian shopkeepers, merchants, and customs officials use عدد constantly when counting goods. The label on a packaged product will say پنج عدد (panj adad, five units). A factory inventory uses عدد. A Tehran bazaar merchant might say دو عدد is the formal version of دو تا. Learners who only learn تا will be understood everywhere, but they will sound oddly informal in any document, contract, or printed price tag. Both classifiers are essential.

How to use it

• سه عدد قلم خریدم (se adad ghalam kharidam) “I bought three pens” (formal register)
• سه تا قلم خریدم (se tâ ghalam kharidam) “I bought three pens” (colloquial, same meaning)
• عدد ۷ عدد محبوبیه (adad-e haft adad-e mahbub-i-ye) “The number seven is a beloved number”
• این جعبه شامل ۱۲ عدد محصوله (in ja’be shâmel-e davâzdah adad mahsul-e) “This box contains 12 units of product”

Cultural note

The split between تا and عدد maps onto the wider register split in Persian between everyday spoken language and formal written language. Persian, more than most languages, maintains a sharp diglossia: the language of the home is not the language of the document. عدد lives on the document side. Job applications, invoices, school report cards, and scientific papers all use عدد. This makes the word important for learners who want to read or write Persian in any professional capacity. The Pure Persian Movement (Farhangestan-e Zaban-e Farsi) has at times proposed replacing عدد with the Pure Persian شماره (shomâre, number), but the two words have specialized in different functions: شماره is now mostly used for assigned numbers (phone number, room number, ranking), while عدد retains the abstract-number sense and the classifier role.

Related expressions

تا (tâ, the colloquial classifier), شماره (shomâre, assigned number), رقم (raqam, digit), تعداد (te’dâd, quantity), شمارش (shomâresh, counting), ریاضی (riyâzi, mathematics). The English equivalents for the classifier use are “piece,” “unit,” “item.” The English equivalents for the noun use are “number,” “figure,” “numeral.”

References

• Dehkhoda
• Vajehyab