This is the 92nd most frequent Swedish word.
annan
"Annan" means "other" or "another" in English.
The word 'annan' here modifies 'dag' (day) and means 'another'. It suggests a different, alternative day.
Jag kan inte gå i dag, men vi kan träffas en annan dag.
I can't go today, but we can meet another day.
Here, 'annan' modifies 'stol' (chair), meaning 'a different one'. It indicates replacing or substitution with another item.
Hon tog fram en annan stol för att ersätta den trasiga.
She brought out another chair to replace the broken one.
In this construction, 'annat' (a neuter form of 'annan') means 'other' and is used to reference an alternative topic, not work.