The term "11 sep bank holiday" functions as a noun phrase. Its core grammatical element is the compound noun "bank holiday," which is being modified by the preceding date, "11 sep." This structure allows the entire phrase to act as a single noun unit within a sentence.
A grammatical breakdown reveals the components and their roles. The head noun is "holiday." The noun "bank" serves as a noun adjunct, modifying "holiday" to specify its type (a public holiday established by banking legislation). The phrase "11 sep" acts as an adjectival phrase, specifying the exact date of the holiday. The number "11" and the abbreviated month "sep" (September) work together to pinpoint a specific instance of the noun they modify.
Understanding this classification is critical for its application in an article. As a noun phrase, it can serve as the subject of a sentence (e.g., "The 11 Sep bank holiday is not recognized nationwide."), the direct object (e.g., "The government did not declare an 11 Sep bank holiday."), or the object of a preposition (e.g., "Questions arose about an 11 Sep bank holiday."). This grammatical flexibility allows the term to be integrated into various sentence structures correctly and effectively.