This is the 2492nd most frequent Arabic word.
واحدا
"واحدا" means "one" (as an object or item, masculine form).
Here, 'واحدا' is used as a quantitative adjective describing the necessity of only one item out of many.
أحتاج إلى واحدا فقط من هذه الأشياء.
I need just one of these items.
In this sentence, 'واحدا' is used to specify one instance from a group of famous movies.
لقد شاهدت واحدا من الأفلام الشهيرة البارحة.
I watched one of the famous movies yesterday.
Here, 'واحدا' is utilized to indicate the act of selecting exactly one option from the menu.