Is “synthesis” singular or plural?
What’s with the word synthesis, and why does it behave the way it does from its singular to plural form? Keep reading.
The researcher presented a new synthesis of the available evidence.
The team completed three different syntheses for the project.
The paper described several interesting synthesis.
Please provide a brief syntheses of your findings.
- Synthesis (pronounced sin·thuh·sis)is singular.
- Syntheses (pronounced sin·thuh·seas) is plural.
What’s the definition of synthesis/syntheses?
The Merriam-Webster defines the word synthesis as “the composition or combination of parts or elements so as to form a whole.”
What’s the plural of synthesis?
The plural of synthesis (i.e., syntheses), is irregular. While it ends in –es as a plural (and, in this sense, follows the regular plural noun form), it does so by replacing its suffix as a singular noun. This is unusual in English grammar. Typically, to form a plural, you would add the -es/-s: books, phones, dogs and cats all form a plural by adding an s to demonstrate plurality. It’s an easy, simple, and straightforward way to form a plural noun—just add the s.
This rule of pluralization doesn’t work in the case of synthesis, hypothesis, thesis, synopsis, crisis, oasis, diagnosis (the list goes on). Each of these nouns/words were introduced to Modern English from the Greek; “a synthesis,” comes from Greek Greek synthesis “composition, a putting together,” from syntithenai “put together, combine,” from syn- “together”. These irregular, Greek words all modify the same way from singular to plural. See the chart below.
“synthesis” is singular and “syntheses” is plural, visualize one whole composition (synthesis) versus multiple compositions (syntheses).
Nouns that end in -sis/-ses
| singular | plural |
| synthesis | syntheses |
| crisis | crises |
| diagnosis | diagnoses |
| oasis | oases |
| synopsis | synopses |
| thesis | theses |
Examples of “synthesis” in context
1. Her synthesis of feminism and socialism ran counter to all other historical currents.
2. His novels are a rich synthesis of Balkan history and mythology.
3. This kind of lighting encourages vitamin D synthesis in the skin.
4. There are procedures for the synthesis of organic compounds from elements.
5. The vitamin participates in the human body’s synthesis of proteins for cellular growth, development, differentiation and ability to adhere to one another.
Examples of “syntheses” in context
1. Retinoic acid is derived mainly by local syntheses through the enzymatic oxidation of retinol.
2. Some of them have already been synthesized and approbated, the syntheses and testing of others is still forthcoming.
3. Over the course of his career, he has taught electromagnetics, communication and information theory, circuit syntheses, and coherent optics.
4. He provided valuable syntheses on taphonomy and biogeography along with numerous papers detailing new species.
5. Various derivatives of tropolone have been synthesized, and recently three independent syntheses of tropolone have been described.
Synonyms of synthesis/syntheses
- admixture
- amalgamation
- combination
- conflation
- alloy
- composite
- mixture
- meld
- blend
- fusion
- integration
- coalescence
What’s the difference between they’re, their, and there?
Work Sheet
What is the correct plural form of the word “synthesis”?
According to the blog post, which of the following words follows a similar irregular pluralization pattern to “synthesis”?
The blog post mentions that the word “synthesis” originated from which language?
Based on the blog post’s usage notes, which sentence uses “synthesis” correctly?
The blog post highlights that the plural form of “synthesis” is unusual in English because it forms the plural by:
The team completed three different for the project.
Please provide a brief of your findings.
Her of feminism and socialism ran counter to all other historical currents.
The paper described several interesting , each offering a new perspective.
There are various methods for the of organic compounds from elements.
Frequently Asked Questions
What’s the plural of synthesis?
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Is “synthesis” singular or plural?
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Why is synthesis plural form irregular?
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How do you pronounce synthesis?
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When do I use synthesis vs syntheses?
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Yash, D. "What’s the Plural of Synthesis?." Grammarflex, Jun 3, 2025, https://www.grammarflex.com/whats-the-plural-of-synthesis/.
Sources
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Definition of synthesis.
