| Subject | English | Icelandic |
| comp., MS | main account | aðallykill (A classifier of economic resource value based on the claims parties make on the economic resources owned by a legal entity and that is used to classify debit and credit entries in an accounting system) |
| comp., MS | main account category | tegund aðallykils (A classifier of a main account) |
| comp., MS | main account derivation rule | afleiðsluregla aðallykils (A rule to determine a main account dimension for classifying the financial consequences of an accounting event) |
| comp., MS | main app | aðalforrit (The wider of the two apps that can appear on the screen simultaneously after a second app is snapped to the screen) |
| comp., MS | main document | aðalskjal (In a mail-merge operation, the document that contains the text and graphics that are the same for each version of the merged document, for example, the return address or salutation in a form letter) |
| math. | main effect | aðalrif |
| math. | main effect | meðalhrif |
| comp., MS | main quotation | aðaltilboð (The primary quotation issued to a customer) |