n. A continued succession of similar things, or of things bearing a similar relation to one another; an extended order, line, or course; sequence; succession: as, a series of kings; a series of calamitous events; definitions arranged in several distinct series.n. In geology, a set of strata possessing some common mineral or fossil characteristic: as, the greensand series; the Wenlock series.n. In chem., a number of elements or compounds which have certain common properties and relations, or which exhibit, when arranged in orderly succession, a constant difference from member to member.n. In numismatics, a set of coins made at any one place or time, or issued by any one sovereign or government.n. In philately, a set of similar postage- or revenue-stamps.n. In mathematics, a progression; also, more usually, an algebraic expression appearing as a sum of a succession of terms subject to a regular law.n. In systematic bot., according to Gray, the first group below kingdom and the next above class: equivalent to subkingdom or division (which see).n. In zoology, a number of genera in a family, of families in an order, etc.; a section or division of a taxonomic group, containing two or more groups of a lower grade: loosely and variably used, like grade, group, cohort, phalanx, etc.n. In ancient prosody, same as colon , 2.n. In bibliography, a set of volumes, as of periodical publications or transactions of societies, separately numbered from another set of the same publication. Abbreviated ser.n. where φ(μ) is defined by the equationn. is equal to for values of φ between −π and +π; but for values between π and 2π, it is equal to ½(π − φ).n. That the n th differential coefficient relatively to x should be equal to 2n! is the necessary and sufficient condition of n being prime.n. A series which is convergent although if the signs of all the terms were the same (or their arguments considered as imaginaries were the same) it would be divergent.n. In mathematics: A sequence of things such that the situation (before or after) of each can be told with respect to any other; a set.n. In electricity, an arrangement of units of a group of cells, generators, or other electrical devices (such as condensers, resistance-coils, lamps, or the like), such that the positive terminal of the first is connected to the negative terminal of the second and so on. See series-connected.n. A series not absolutely convergent.n. In electricity See series-parallel circuit.n. Same as absolutely convergent series.