Meaning

• A number of things that follow on one after the other or are connected one after the other.

  "A series of seemingly inconsequential events led cumulatively to the fall of the company."

• A television or radio program which consists of several episodes that are broadcast in regular intervals

  "“Friends” was one of the most successful television series in recent years."

• The sequence of partial sums \sum_{i=1}^n{a_i} of a given sequence ai.

  "The harmonic series has been much studied."

• A group of matches between two sides, with the aim being to win more matches than the opposition.

  "The Blue Jays are playing the Yankees in a four-game series."

• An unranked taxon.

• A subdivision of a genus, a taxonomic rank below that of section (and subsection) but above that of species.

• A parcel of rough diamonds of assorted qualities.

• A set of consonants that share a particular phonetic or phonological feature.

Meaning

• Connected one after the other in a circuit.

  "You have to connect the lights in series for them to work properly."