Questions & Answers about Rigningin er falleg í kvöld.
Rigning is the basic noun meaning rain (as precipitation).
Rigningin is rigning + -in, where -in is the definite article attached to the end of the word.
So:
- rigning = rain (in general, no article)
- rigningin = the rain
Icelandic usually does not use a separate word like English the. Instead, the definite article is a suffix:
- bók → bókin (book → the book)
- rigning → rigningin (rain → the rain)