This is the 4597th most frequent Arabic word.
أول
"أول" means "first" in English.
Here, "أول" is used as an adjective meaning 'first', describing the day.
كان هذا أول يوم في المدرسة.
This was the first day of school.
In this example, "أولًا" functions as an adverb meaning 'firstly' or 'first'.
قال المعلم أولًا نحتاج إلى قراءة القواعد.
The teacher said, 'First, we need to read the rules.'
Here, "أول" is used as a noun meaning 'the beginning' or 'the forefront'.