The World Series consists of a series of seven games between the champions of the National and American Baseball Leagues. A series is a group of similar things happening one after the other.
Your favorite TV drama that comes on week after week is a series. Each episode is one in a series of many. If you make one mistake after another as you try to make dinner, you could say that the meal arrived on the table despite a series of culinary mishaps. If you have several conversations with your parents about how late you can stay out, you might say your curfew was determined by a series of discussions.
Definitions of series
1
n similar things placed in order or happening one after another
“they were investigating a
series of bank robberies”
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Stations, Stations of the Cross
(Roman Catholic Church) a devotion consisting of fourteen prayers said before a series of fourteen pictures or carvings representing successive incidents during Jesus' passage from Pilate's house to his crucifixion at Calvary

chain, concatenation
a series of things depending on each other as if linked together

cordon
a series of sentinels or of military posts enclosing or guarding some place or thing

course, line
a connected series of events or actions or developments

cycle
a series of poems or songs on the same theme

electrochemical series, electromotive force series, electromotive series
a serial arrangement of metallic elements or ions according to their electrode potentials determined under specified conditions; the order shows the tendency of one metal to reduce the ions of any other metal below it in the series

hierarchy
a series of ordered groupings of people or things within a system

nexus
a connected series or group

patterned advance, progression
a series with a definite pattern of advance

blizzard, rash
a series of unexpected and unpleasant occurrences

sequence
serial arrangement in which things follow in logical order or a recurrent pattern

string, train
a sequentially ordered set of things or events or ideas in which each successive member is related to the preceding

succession
a group of people or things arranged or following in order

wave train
a succession of waves spaced at regular intervals

helium group
the series of inert gases

actinide series
(chemistry) a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium

lanthanide series
the rareearth elements with atomic numbers 57 through 71; having properties similar to lanthanum

cistron, factor, gene
(genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity

string
a linear sequence of symbols (characters or words or phrases)

combination
a sequence of numbers or letters that opens a combination lock

combination
a coordinated sequence of chess moves

Fibonacci sequence
a sequence of numbers in which each number equals the sum of the two preceding numbers

catena
a chain of connected ideas or passages or objects so arranged that each member is closely related to the preceding and following members (especially a series of patristic comments elucidating Christian dogma)

daisy chain
(figurative) a series of associated things or people or experiences

celestial hierarchy
the collective body of angels

data hierarchy
an arrangement of data consisting of sets and subsets such that every subset of a set is of lower rank than the set

taxonomy
a classification of organisms into groups based on similarities of structure or origin etc

cascade
a succession of stages or operations or processes or units

parade
an extended (often showy) succession of persons or things

run, streak
an unbroken series of events

arithmetic progression
(mathematics) a progression in which a constant is added to each term in order to obtain the next term

geometric progression
(mathematics) a progression in which each term is multiplied by a constant in order to obtain the next term

harmonic progression
(mathematics) a progression of terms whose reciprocals form an arithmetic progression

current, flow, stream
dominant course (suggestive of running water) of successive events or ideas

codon
a specific sequence of three adjacent nucleotides on a strand of DNA or RNA that specifies the genetic code information for synthesizing a particular amino acid
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order, ordering, ordination
logical or comprehensible arrangement of separate elements
n a group of postage stamps having a common theme or a group of coins or currency selected as a group for study or collection
n (mathematics) the sum of a finite or infinite sequence of expressions
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power series
the sum of terms containing successively higher integral powers of a variable

convergence, convergency
the approach of an infinite series to a finite limit

divergence, divergency
an infinite series that has no limit

geometric series
a geometric progression written as a sum

Fourier series
the sum of a series of trigonometric expressions; used in the analysis of periodic functions

exponential series
a series derived from the expansion of an exponential expression
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multinomial, polynomial
a mathematical function that is the sum of a number of terms
n a periodical that appears at scheduled times
 Synonyms:
 serial, serial publication
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semiweekly
a periodical that is published twice each week (or 104 issues per year)

weekly
a periodical that is published every week (or 52 issues per year)

semimonthly
a periodical that is published twice each month (or 24 issues per year)

monthly
a periodical that is published every month (or 12 issues per year)

quarterly
a periodical that is published every quarter (or four issues per year)

bimonthly
a periodical that is published twice a month or every two months (either 24 or 6 issues per year)

biweekly
a periodical that is published twice a week or every two weeks (either 104 or 26 issues per year)
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periodical
a publication that appears at fixed intervals
n a serialized set of programs
“a comedy
series”
“the Masterworks concert
series”
 Synonyms:
 serial
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soap opera
a serialized program usually dealing with sentimentalized family matters that is broadcast on radio or television (frequently sponsored by a company advertising soap products)

tetralogy
a series of four related works (plays or operas or novels)
n (sports) several contests played successively by the same teams
“the visiting team swept the
series”
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home stand
a series of successive games played at a team's home field or court

World Series
series that constitutes the playoff for the baseball championship
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competition, contest
an occasion on which a winner is selected from among two or more contestants
n (electronics) connection of components in such a manner that current flows first through one and then through the other
“the voltage divider consisted of a
series of fixed resistors”
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connectedness, connection, connexion
a relation between things or events (as in the case of one causing the other or sharing features with it)