This is the 38th most frequent Armenian word.
առաջին
"First."
The word "առաջին" is used as an adjective to describe the noun "ամսը", indicating the ordinal 'first' in a sequence.
Առաջին անգամը միշտ հիշարժան է։
The first time is always memorable.
Here, "առաջին" specifies the grade level (class), again functioning as an ordinal number adjective.
Մեր առաջին դասարանը հիանալի ուսուցիչ ունի։
Our first grade has an excellent teacher.
In this sentence, "առաջին" is utilized as a nominative to describe the subject's sequence in being the earliest to arrive.