| Subject | English | Icelandic |
| math. | first return time | fyrst skila skipti |
| comp., MS | return address | utanáskrift sendanda (The sender's address, to which a letter or parcel can be returned if undeliverable) |
| math. | return level | aftur stig |
| comp., MS | return materials authorization number | númer vöruskilaheimildar (A reference number that is used to authorize and track goods returned for repair or refund. A return materials authorization is issued by a sales entity that authorizes a buying company to return goods) |
| comp., MS | return on equity | arðsemi eigin fjár (The ratio of profitability calculated by dividing net income by owners' equity) |
| math. | return period | endurkomutími |
| math. | return states | aftur ríkja |
| math. | return time | endurkomutími |