seriile

Seriile is a Romanian noun serving as the plural definite form of seria. The term has several related meanings, depending on context. In everyday language it commonly refers to a group or sequence of related works (such as books, films, or television episodes). In mathematics and statistics it designates specific technical concepts, and in data analysis it is used for time-related data.

In mathematics, o serie (the singular) denotes the sum of the terms of a sequence and can be finite or infinite. The notions of convergence, partial sums and different types of series (geometric, harmonic, etc.) are central to its study. When speaking about more than one such object, Romanian uses seriile (the definite plural). The term should not be confused with șir or secvență, which are typically used for sequences rather than sums.

In literature and media, seriile describe a connected set of works sharing a common world, cast, or storyline, such as a serie de romane (a series of novels) or o serie de filme/episoade (a film or TV series). In Romanian, the more general, indefinite plural is serii (e.g., serii de romane), while seriile emphasizes a specified set.

In statistics and data analysis, se referă la serii de timp, or time series, collections of measurements taken at successive points in time. These are used to analyze trends, seasonal patterns and other temporal dynamics.

Etymology traces seriile to the French série and the Latin series, reflecting its broad cross-domain usage. The distinction between seriile (definite plural) and serii (indefinite plural) is important in technical and everyday language.