This is the 505th most frequent Icelandic word.
bæjarbúa
In English, "bæjarbúa" means "inhabitants of a town."
The word "bæjarbúar" here means "townspeople" and is used in the nominative plural form to refer collectively to the inhabitants of a town.
Bæjarbúar fögnuðu þjóðhátíðardeginum með hátíð.
The townspeople celebrated the national holiday with a festival.
The term "bæjarbúum" here is in the dative plural form, used to indicate the individuals attending the meeting.
Fundurinn var vel sóttur af bæjarbúum.
The meeting was well attended by the townspeople.
The word "bæjarbúa" in this sentence is in the genitive plural form to indicate possession or association, specifically referring to the ideas coming from the townspeople.