| Subject | English | Arabic |
| math. | addition fact | حقيقة جمعية |
| math. | addition of variates | جمع المتغيرات ؛ اضافة متغيرات |
| comp., MS | addition operator | عامل إضافة (The + character, used to indicate addition or a positive number) |
| environ. | addition polymer A polymer formed by the chain addition of unsaturated monomer molecules, such as olefins, with one another without the formation of a by-product, as water; examples are polyethylene, polypropylene and polystyrene | بلمرة بالإضافة |
| math. | addition sentence | جملة جمعية |
| math. | addition sign | علامة الجمع |
| econ., amer. | addition to surplus | إضافة للاحتياطي العام |
| econ. | addition to taxes | ضرائب إضافية |
| econ. | addition to taxes | زيادة الضرائب |
| econ. | addition to the stock | زيادة رأس المال بضم الاحتياطيات |
| econ. | addition to the stocks | زيادة المخزون |
| econ. | additions and betterments | إضافات وتحسينات |
| genet. | alien addition line | خط إضافى غريب |
| environ. | chemical addition Chemical reaction in which one or more of the double bonds or triple bonds in an unsaturated compound is converted to a single bond by the addition of other atoms or groups | إضافة كيميائية |
| math. | commutative property of addition | خاصية الإبدال في الجمع |
| econ. | error of addition | خطأ فِي الجمع |
| comp., MS | fixed asset addition | إضافة أصل ثابت (An add-on item to a fixed asset that is considered part of the fixed asset and is not tracked as its own fixed asset, such as an extra battery for a laptop. Typically, an add-on item is maintenance or an improvement and relates to a write-up adjustment) |
| org.name. | General Principles for the Addition of Essential Nutrients to Foods | المبادئ العامّة لإضافة العناصر الغذائيّة الأساسيّة للأغذية |
| econ. | horizontal addition | جمع أُفُقِي |
| math. | identity element for addition | عنصر محايد في الجمع |
| math. | repeated addition | جمع متكرر |
| math. | zero as the identity element in addition | الصفر آعامل محايد في الجمع |
| math. | zero property of addition | خاصية الصفر في الإضافة |