—n. 1. a group or a number of related or similar things, events, etc., arranged or occurring in temporal, spatial, or other order or succession; sequence.
2. a number of games, contests, or sporting events, with the same participants, considered as a unit: The two baseball clubs played a five-game series. 3. a set, as of coins or stamps.
4. a set of successive volumes or issues of a periodical published in like form with similarity of subject or purpose.
5. Radio and Television. a. a daily or weekly program with the same cast and format and a continuing story, as a soap opera, situation comedy, or drama.
b. a number of related programs having the same theme, cast, or format: a series of four programs on African wildlife. 6. Math. a. a sequence of terms combined by addition, as 1 + ½ + ¼ + 1/8 + ...½ —n. b. See infinite series. 7. Rhet.a succession of coordinate sentence elements.
8. Geol.a division of stratified rocks that is of next higher rank to a stage and next lower rank to a system, comprising deposits formed during part of a geological epoch.
9. Elect.an end-to-end arrangement of the components, as resistors, in a circuit so that the same current flows through each component. Cf. parallel (def. 13).
10. Chem.a group of related chemical elements arranged in order of increasing atomic number: the lanthanide series.
—adj. Elect.consisting of or having component parts connected in series: a series circuit; a series generator.