This is the 2645th most frequent Arabic word.
العمانية
"العمانية" means "Omani" in English, referring to something or someone from Oman.
In this sentence, 'العمانية' is an adjective describing the noun 'مدينة مسقط', indicating that the city is related to Oman or is Omani.
زرت مدينة مسقط العمانية العام الماضي.
I visited the Omani city of Muscat last year.
Here, 'العمانية' is functioning as an adjective modifying the noun 'الثقافة', specifying that the culture mentioned pertains to Oman.
قرأت تقريراً عن الثقافة العمانية.
I read a report about Omani culture.
In this instance, 'العمانية' describes 'الفتاة', indicating her nationality or origin as being from Oman.