This is the 606th most frequent Icelandic word.
einn
The Icelandic word "einn" means "one" in English.
Here, 'einn' means 'one' and indicates a singular bird.
Ég sá einn fugl í trénu.
I saw one bird in the tree.
In this instance, 'ein' (feminine form of 'einn') means 'alone' and refers to her coming by herself.
Hún kom ein í partíið.
She came alone to the party.
Here, 'einn' is used reflexively meaning 'as one' or 'together.'