The term "911 kejadian" is a noun phrase. The head of the phrase is the word "kejadian," which is a noun in the Indonesian and Malay languages meaning "incident," "event," or "occurrence." The numerical signifier "911" functions as a proper adjective or a specifier, modifying the noun to designate a specific, globally recognized historical event: the terrorist attacks in the United States on September 11, 2001.
Linguistically, the phrase is a compound term that combines an international numerical shorthand with a local noun. The word "kejadian" is derived from the root verb "jadi" (to happen, to become), with the nominalizing suffix "-an" transforming it into a noun that signifies the instance or result of the action. The "911" component is adopted directly from the American date format (9/11 for September 11th) and serves as the unique identifier for this particular "kejadian." This structure, where a number or proper name precedes and specifies a common noun, is a standard grammatical construction.
In practical application, identifying "911 kejadian" as a noun phrase is essential for correct grammatical analysis and comprehension. It functions as a singular entity within a sentence, capable of acting as a subject, object, or complement. The term is the standard, formal designation for the 9/11 attacks in Indonesian and Malay media, academic writing, and discourse, making its grammatical classification fundamental to understanding its role and meaning in any given text.