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Plural of Basis: Understanding the Correct Usage and Origin

plural of basis

The word “basis” holds significant weight in both everyday and specialized language, serving as a foundational term across various fields such as mathematics, finance, and general English usage. Its importance stems from its role in establishing a fundamental point or underlying principle from which further understanding or analysis can be developed. This article delves deep into the plural form of “basis,” exploring its linguistic nuances, common usage, and the broader implications of its singular and plural forms.

The Singular and Plural of Basis

Singular: Basis

Plural: Bases

meaning of basis

Understanding Basis

Definition of Basis:

At its core, "basis" refers to the underlying support or foundation for an idea, argument, or process. It can denote a principle, standard, or rule that forms the starting point of a work or theory.

Usage of Basis

The term “basis” is used across various disciplines, each adding its layer of meaning:

  • Mathematics and Science: Refers to a set of linearly independent vectors in a vector space or the starting point of a mathematical argument.
  • Finance: The difference between the cost of a commodity and its selling price.
  • General Usage: The main ingredient or foundation upon which something stands or is built.

Use of Basis in Sentences

To fully grasp the usage of “basis,” here are examples in different contexts:

  1. Mathematics: “The set of polynomials forms a basis for the vector space.”
  2. Finance: “The basis of our investment strategy relies on long-term growth.
  3. Philosophy: “His argument had a strong moral basis.”
  4. Daily Conversation: “Trust is the basis of any strong relationship.”
  5. Science: “The research was conducted on the basis of the data collected from the field.”

Common Mistakes and Confusions

  • Bases vs. Basis: Confusion often arises in distinguishing between the singular “basis” and its plural “bases.” Remember, “bases” is used when referring to multiple foundational principles or supports.
  • Pronunciation of Bases: The pronunciation of “bases” (/ˈbeɪsiːz/) can be mistaken with “base’s” (possessive form of “base“) or “bases” (/ˈbeɪsɪz/), the plural of “base.” Context usually clarifies the intended meaning.

Commonly Asked Questions

  • Q: Can “basis” be used in plural form when talking about multiple principles?
    • A: Yes, when referring to multiple foundational principles or supports, “bases” is the correct plural form.
  • Q: Is the transition from “basis” to “bases” consistent in all uses?
    • A: Yes, regardless of the field or context, the plural of “basis” is always “bases.”
  • Q: How do you pronounce “bases” in the context of “basis”?
    • A: It is pronounced /ˈbeɪsiːz/, with emphasis on the first syllable and a long “ee” sound in the second.


Understanding the plural form of “basis” is crucial for accurate and effective communication across various disciplines. The transition from “basis” to “bases” represents more than a simple linguistic rule; it signifies the expansion of foundational principles or supports. By mastering the use of “basis” and “bases,” one ensures clarity and precision in discourse, whether in academic, professional, or everyday contexts. The importance of correct plural usage cannot be overstated, as it underpins the coherence and integrity of both written and spoken language.


What is the plural of “basis”?

The plural form of “basis” is “bases.”

Why is it pluralized as “bases”?

The plural follows the standard English rule for forming plurals of nouns ending in “is,” where the “is” is replaced with “es.” This rule applies to nouns like “basis” and “thesis.

Can I use “baseis” as a plural form of “basis”?

No, “baseis” is not a valid English plural form, despite its existence in Greek. The word “bases” is the only acceptable plural form for “basis.”

What does “basis” mean?

Basis” is a noun used to denote something from which another thing develops or can develop. It can refer to an idea, a set of ideas, or a foundation for a specific concept or policy.

How is “basis” used in a sentence?

Basis” can indicate a reason for doing something, serve as the grounds for a legal ruling, or be the information on which decisions are made. It can also describe a fixed pattern or system for doing something, often used in phrases such as “on a regular basis” or “on a first-come first-served basis.”

Why does “basis” follow the pluralization rule for nouns ending in “is”?

Although the root of “basis” is Greek, the word has been anglicized, and its plural form follows English pluralization rules. Not all nouns ending in “s” form their plural by adding “es.” The specific rule for nouns ending in “is” overrides this generalization.

Are there alternative plural forms for “basis”?

No, there are no alternative plural forms for “basis” in English. The plural form is always “bases.”

Is “bases” the plural form for the noun “base” as well?

Yes, “bases” is also the plural form for the noun “base.”

Jessica Smith

Jessica Smith

Jessica Smith, writer at, blends creativity with insight, exploring technology, culture, and psychology. With a background in English Literature, she crafts engaging stories inspired by nature and urban life. Outside writing, she enjoys exploring and continuous learning.View Author posts

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