series

noun

se·​ries ˈsir-(ˌ)ēz 

plural series

often attributive

1

a

: a number of things or events of the same class coming one after another in spatial or temporal succession

a concert series

the hall opened into a series of small rooms

b

: a set of regularly presented television programs each of which is complete in itself

2

: the indicated sum of a usually infinite sequence of numbers

3

a

: the coins or currency of a particular country and period

b

: a group of postage stamps in different denominations

4

: a succession of volumes or issues published with related subjects or authors, similar format and price, or continuous numbering

5

: a division of rock formations that is smaller than a system and comprises rocks deposited during an epoch

6

: a group of chemical compounds related in composition and structure

7

: an arrangement of the parts of or elements in an electric circuit whereby the whole current passes through each part or element without branching compare parallel

8

: a set of vowels connected by ablaut (such as i, a, u in ring, rang, rung)

9

: a number of games (as of baseball) played usually on consecutive days between two teams

in town for a 3-game series

10

: a group of successive coordinate sentence elements joined together

11

: soil series

12

: three consecutive games in bowling

see also:

in series

Examples of series in a Sentence

a five-part series on the history of baseball

a series of articles on global warming

The Yankees played a three-game series against the Red Sox last week.

The play-off series between the two teams begins next week.

Recent Examples on the Web

The deadly crash is the latest in a series of fatal collisions along the 14-mile Fix 50 construction corridor. — Carmela Karcher, CBS News, 12 Aug. 2026

Because the show is titled simply after its protagonist’s name, Ted Lasso didn’t necessarily have to remain a series about an American coach leading a British soccer team. — Keith Phipps, Vulture, 12 Aug. 2026

The city of about 250,000 people has been rattled by a series of drone strikes that hit oil and power infrastructures. — ABC News, 12 Aug. 2026

Reggie Bannister, the actor best known for playing the iconic ice cream man Reggie in the Phantasm horror film series, has died peacefully at his home Sunday at 80. — Tim Lammers, Forbes.com, 11 Aug. 2026

Word History

Etymology

Latin, from serere to join, link together; akin to Greek eirein to string together, hormos chain, necklace, and perhaps to Latin sort-, sors lot

First Known Use

1618, in the meaning defined at sense 1a

Phrases Containing series

• alternating series
• chain/sequence/series of events
• Fourier series
• geometric series
• harmonic series
• in series
• Maclaurin series
• power series
• soil series
• sub-series
• Taylor series
• time series

Rhymes for series

• eries
• queries
• theories
• wearies
• kashmiris
• presbyteries

Kids Definition

series

noun

se·​ries ˈsi(ə)r-ēz 

plural series

1

: a number of things or events arranged in order and connected by being alike in some way

a concert series

a series of talks

2

: a division of rock formations smaller than a system comprising rocks deposited during an epoch

3

: an arrangement of the parts of or elements in an electric circuit whereby the whole current passes through each part or element without branching

4

: a group of sentence elements of the same rank that follow one after another and are joined together

the phrase "a bowl of oranges, apples, and bananas" has a series of three nouns

Medical Definition

series

noun

se·​ries ˈsi(ə)r-(ˌ)ēz 

plural series

1

: a number of things or events of the same class coming one after another in spatial or temporal succession

described a new series of cases

2

: a group of specimens or types progressively differing from each other in some morphological or physiological attribute

a series of antitoxins

3

: a group of chemical compounds related in composition and structure