This is the 726th most frequent Arabic word.
إضافية
Additional.
The word "إضافية" is used here as an adjective describing the noun "سرعة" (speed), indicating the additional or extra nature of the speed.
أركض بسرعة إضافية لتحسين لياقتي.
I run with additional speed to improve my fitness.
The word "إضافية" is used here as an adjective describing the noun "ساعات" (hours), signifying additional or extra hours beyond the usual.
طلبت ساعات إضافية لإنجاز العمل.
I requested extra hours to complete the work.
In this context, "إضافية" describes "معلومات" (information), indicating that the information presented is supplementary to what was initially provided.