1repetition

1repetition is a term used in some disciplines to denote a single repetition of a unit or element. It is not a standardized technical term; its precise meaning varies by field. Generally, it designates the smallest unit of repetitive occurrence and is used to contrast with multiple repetitions or with a non-repeated instance.

In mathematics and combinatorics, 1-repetition can describe a sequence of length n drawn from a set of size m that contains exactly one repeated element, with all remaining elements distinct. Counting such sequences involves selecting the value that is repeated, choosing the two positions for its occurrences, and arranging the remaining n−2 distinct elements. The concept illustrates how a single duplication affects combinatorial counts.

In music theory or pedagogy, 1-repetition can refer informally to a motif, phrase, or section that is heard a second time after its initial presentation. Formal terms more commonly used include repeats, da capo structures, or repeat signs. The label 1-repetition emphasizes that the section is played twice in total: once initially and once as a repeat.

In computing and data generation, 1-repetition may describe executing a procedure exactly one additional time after the first run, often expressed as “repeat once” in scripts or test plans. It is used in quality assurance, sampling, and experimental design to specify a duplication level without creating longer repetitive cycles.

See also repetition, reduplication, duplication, one-shot, single-copy.