This is the 660th most frequent Armenian word.
ծննդյան
The Armenian word "ծննդյան" means "of birth" or "birth-related."
The word 'ծննդյան' here qualifies 'տոնն' to specify that it is related to birth.
Այսօր իմ ծննդյան տոնն է։
Today is my birthday.
The word 'ծննդյան' here describes 'խնջույքի', indicating the occasion of the party.
Մենք գնացինք ծննդյան խնջույքի։
We went to a birthday party.
The word 'ծննդյան' is used here to describe the shirt, highlighting that it is a gift for a birthday.