mánuður
Mánuður is the Icelandic word for month. It is used to refer to a calendar month and to denote a period of roughly one-twelfth of a year. In everyday language it appears in phrases such as “fimm mánuðir” (five months) and “í þessum mánuði” (in this month). In the civil calendar, a mánuður can have 28 to 31 days, depending on the month, with February having 28 days in common years and 29 days in leap years.
Etymology: The word is descended from Old Norse mánuðr and is cognate with Danish måned, Norwegian måned,
Usage and forms: The plural form is mánuðir. It is used across various contexts to express durations