fjórðungslegur
Fjórðungslegur is an Icelandic adjective that translates to "quarterly" or "of a quarter" in English. It refers to something that occurs or is measured in periods of three months, which constitute one quarter of a year. This term is commonly used in financial and business contexts to describe reporting periods, such as quarterly earnings reports. For example, a company might release its fjórðungslegur uppgjör (quarterly report) detailing its financial performance over the preceding three months.
The concept of "fjórðungslegur" is directly linked to the division of a year into four equal parts.