The keyword term "patriot day boston 2013" functions grammatically as a proper noun phrase. It operates as a single semantic unit to name a specific and unique event, distinguishing it from all other instances of the Patriots' Day holiday in other locations or years.
This phrase is a compound construction. The core element is the proper noun "Patriot Day," which names the civic holiday. The subsequent elements, "Boston" (a proper noun) and "2013" (a cardinal number), function as adjectival modifiers that specify the precise location and time. The significance of this particular combination is overwhelmingly defined by the historical event that occurred on that day: the Boston Marathon bombing. The phrase has thus become inextricably linked to this tragedy, serving as a specific reference point.
Recognizing the term as a proper noun phrase is critical because it identifies the phrase not just as a set of descriptive coordinates, but as the formal name for a singular, historically significant event. In media, academic, and public discourse, the phrase operates as a unique signifier for the bombing, its aftermath, and the collective memory associated with it. Its grammatical classification reflects its function as a shorthand for a complex and impactful moment in history.
