What is the Plural of 'Series'?

By Shanea Patterson, updated on October 27, 2022

When creating the plural form of certain words, a lot of people get confused – especially with words like 'series.'

The plural form of the word ‘series’ is ‘series.’ It doesn’t change at all.

Is ‘Series’ Singular or Plural

The word ‘series’ doesn’t follow traditional rules of pluralization for nouns. The standard rule is to add an ‘s’ or ‘es’ to pluralize most words.

For example:

  • Bed > Beds
  • Shoe > Shoes
  • Door > Doors
  • Catch > Catches
  • Itch > Itches
  • Watch > Watches
  • Tux > Tuxes

With words ending in ‘f’ or ‘fe,’ you’d drop the ‘f’ and add ‘ves.’ That’s the case for words like:

  • Knife > Knives
  • Wolf > Wolves
  • Loaf > Loaves
  • Leaf > Leaves
  • Calf > Calves
  • Wife > Wives

But some words don't change at all in their plural forms. Other examples of this in the English language include:

  • Salmon > Salmon
  • Barracks > Barracks
  • Hovercraft > Hovercraft
  • Sheep > Sheep
  • Gallows >Gallows
  • Moose > Moose
  • Deer > Deer

Plural of Series 

As you learned above, the word in question doesn’t change in its plural form, which should make it easy to remember.

Is ‘A Series’ Singular or Plural

Since the word doesn’t change in its plural form, ‘series’ is both singular and plural.

Definition & Meaning

Before we discuss how to use it in a sentence, let’s define the word.

The definition is “a number of things or events of the same class coming one after another in spatial or temporal succession” or “a set of regularly presented television programs, each of which is complete in itself,” according to Merriam-Webster.

Another definition is “the indicated sum of a usually infinite sequence of numbers” and “the coins or currency of a particular country and period.”

However, it could also mean “a set of vowels connected by ablaut (such as I, a, u in ring, rang, rung),” “a group of chemical compounds related in composition and structure,” and “an arrangement of the parts or elements in an electric circuit whereby the whole current passes through each part or element without branching.”

It could also refer to “the number of games (as of baseball) played usually on consecutive days between two teams” and three consecutive games in bowling.”

How to Use Both Forms in a Sentence

Now that you’re well-versed in how to pluralize and define the word, we can move on to using both forms in a sentence.

Here’s how you’d use the singular form in a sentence.

  • The baseball world series game is going to be the best one yet.
  • There were a series of strange occurrences in our neighborhood last week.
  • Did you watch that new TV series about ghosts and vampires on Netflix?

Here’s how you’d use the plural form in a sentence.

  • Two series of workshops are scheduled for this weekend.
  • Three of our favorite series are being renewed this fall; we’re so excited!
  • The series of doors separating you from the lobby are a headache.
  • He never saw the series of left hooks coming his way and didn’t have time to duck.

When forming sentences with either form, make sure your subjects agree with your verbs.

Final Thoughts on ‘Series’ 

We’ve covered how to pluralize the word ‘series’ and found that it doesn’t change – similar to words like ‘sheep’ and ‘deer.’

Remember that you don’t have to do anything to change the word into its plural form.

If you’re struggling with remembering how to pluralize common English words, browse our library of confusing words.

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Written By:
Shanea Patterson
Shanea Patterson is a writer based in New York and loves writing for brands big and small. She has a master's degree in professional writing from New York University and a bachelor's degree in English from Mercy College.

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