This is the 611th most frequent Icelandic word.
allri
The Icelandic word "allri" means "all" or "every" in the dative singular feminine form.
The word 'allri' is used in the dative singular feminine form of the adjective 'allur', meaning 'entire' or 'whole', to agree with 'fjölskyldunni', the noun it modifies and which is in the dative singular feminine.
Ég þakka allri fjölskyldunni fyrir aðstoðina.
I thank the entire family for the assistance.
Here, 'allri' is in the dative singular feminine form of 'allur', modifying 'deildinni', which also takes the dative singular feminine form.
Á fundinum ræddum við um lausnir fyrir allri deildinni.
At the meeting, we discussed solutions for the entire department.
In this case, 'allri' modifies 'getu', in dative singular feminine, indicating entirety or completeness of the abilities.