121st

121st is the ordinal form of the number 121, used to identify the 121st item in an ordered sequence. It appears across many domains to mark a particular instance within a series, such as a military unit, a legislative session, a street name, or a commemorative anniversary. The precise meaning depends on context.

In military contexts, numbers label units within larger formations, including regiments, battalions, and squadrons. A 121st unit may exist in different countries and historical periods, with its exact organization, allegiance, and role reflecting national military traditions and circumstances. The designation helps distinguish between similarly named units across time and space.

Beyond the armed forces, the 121st designation is used for geographic and administrative purposes, such as streets or districts (for example, 121st Street) and for numbering legislative or parliamentary sessions where applicable. The 121st day of the year serves as a calendar reference that falls on May 1 in common years and on April 30 in leap years, illustrating another common usage of ordinal dates. The term is also applied to anniversaries, tournament rounds, catalogs, and other ordered lists to indicate the 121st position.

Because its meaning depends on context, 121st functions as a generic label rather than a standalone concept. It appears in reference works to aid disambiguation among similarly numbered items and in everyday usage wherever ordinal numbering is required.