AD1

AD1 may refer to several distinct concepts across different fields. It does not represent a single standard definition, but rather a code, designation, or abbreviation used in various contexts.

In historical dating, AD1 denotes the first year of the Anno Domini era, corresponding to 1 CE in the proleptic Gregorian calendar. The term is used in chronology, archaeology, and historical writing to anchor events to a conventional era starting point.

In biology and medicine, abbreviations derived from the word Ad or AD can denote adenoviruses; some sources have used AD1 as shorthand for Adenovirus type 1, though current practice typically uses AdV-1 or AdV-1 for clarity. As with many shorthand forms, usage varies by author and publication.

In technology, AD1 is employed as a model, part, or revision code by various manufacturers. Because it is not tied to a single standard, its meaning must be inferred from the product line or documentation.

Across other domains such as data management, education, or software tooling, AD1 can appear as a dataset identifier, course code, or internal designation. In each case, the exact meaning depends on the context and the issuing organization.

Because AD1 has multiple meanings, providing context is essential to determine its intended interpretation. See also the broader AD disambiguation and related dating or nomenclature references for clarification.