Questions & Answers about Haustið er stutt en rólegt.
Haust is autumn / fall, and haustið is the autumn / the fall.
Icelandic usually talks about seasons with the definite article, even when English would often leave it out:
- Haustið er stutt. – Autumn is short / The autumn is short.
- Veturinn er kaldur. – Winter is cold / The winter is cold.
So -ið is the definite article attached to the noun:
- haust (indefinite: autumn)
- haustið (definite: the autumn)
Yes. In haustið, the -ið is the definite article meaning the, attached as a suffix to the noun.
For a regular neuter noun like haust:
- haust = autumn (indefinite)
- haustið = the autumn (definite)
Neuter nouns in the nominative singular often take -ið as their definite ending:
- barn → barnið (the child)
- bréf → bréfið (the letter)
- haust → haustið (the autumn)