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From The Collaborative International Dictionary of English v.0.48:
Series \Se"ries\, n. [L. series, fr. serere, sertum, to join or bind together; cf. Gr. ??? to fasten, Skr. sarit thread. Cf. Assert, Desert a solitude, Exert, Insert, Seraglio.] 1. A number of things or events standing or succeeding in order, and connected by a like relation; sequence; order; course; a succession of things; as, a continuous series of calamitous events. [1913 Webster] During some years his life a series of triumphs. --Macaulay. [1913 Webster] 2. (Biol.) Any comprehensive group of animals or plants including several subordinate related groups. [1913 Webster] Note: Sometimes a series includes several classes; sometimes only orders or families; in other cases only species. [1913 Webster] 3. (Bot.) In Engler's system of plant classification, a group of families showing certain structural or morphological relationships. It corresponds to the cohort of some writers, and to the order of many modern systematists. [Webster 1913 Suppl.] 4. (Math.) An indefinite number of terms succeeding one another, each of which is derived from one or more of the preceding by a fixed law, called the law of the series; as, an arithmetical series; a geometrical series. [1913 Webster] 5. (Elec.) A mode of arranging the separate parts of a circuit by connecting them successively end to end to form a single path for the current; -- opposed to parallel. The parts so arranged are said to be in series. [Webster 1913 Suppl.] 6. (Com.) A parcel of rough diamonds of assorted qualities. [Webster 1913 Suppl.]