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Constantness vs. Constancy: What's the Difference?

By Aimie Carlson & Janet White || Updated on May 23, 2024
Constantness refers to the quality of being unchanging, while constancy refers to steadfastness or unwavering loyalty.

Key Differences

Constantness describes the state or quality of being unchanging or consistent over time. It emphasizes the lack of variation and stability in a condition or state. For example, the constantness of the temperature in a controlled environment means that the temperature does not fluctuate. Constancy, on the other hand, refers to steadfastness, faithfulness, or loyalty, often in a relationship or a belief. It highlights unwavering commitment and reliability. For instance, the constancy of a friend means that the friend remains loyal and dependable through various circumstances.
Constantness is used to describe physical or abstract states that remain unchanged. It is often associated with stability in conditions such as speed, temperature, or behavior, indicating a steady and unaltered state. Constancy is more commonly applied to human attributes, relationships, and abstract concepts such as faith and loyalty. It signifies a deep-rooted and enduring steadfastness or reliability, often in emotional or moral contexts.
Constantness implies a quantitative aspect of being the same over time, such as a constant speed or constant temperature, often used in scientific or technical discussions. Constancy conveys a qualitative aspect of being unchanging in loyalty or principles, such as the constancy of a partner's love or the constancy of moral values, often used in personal and philosophical contexts.

Comparison Chart


Quality of being unchanging
Steadfastness or unwavering loyalty


Physical/abstract states
Human attributes/relationships


Stability in conditions
Loyalty and reliability


Quantitative aspect
Qualitative aspect


Constantness of temperature
Constancy of a friend's support

Constantness and Constancy Definitions


Lack of variation over time.
The constantness of his daily routine provides a sense of security.


Unwavering commitment.
The constancy of his dedication to his studies paid off.


Uniformity in behavior or characteristics.
The constantness of her performance makes her a reliable employee.


Steadfastness in loyalty or principles.
His constancy in supporting his team is admirable.


The quality of being unchanging or consistent.
The constantness of the factory's output ensures steady supply.


Faithfulness and dependability.
Her constancy as a friend is truly remarkable.


Stability in a particular condition.
The constantness of the Wi-Fi signal is crucial for remote work.


Reliability in maintaining a certain state or course.
The constancy of their love has withstood many challenges.


Continuous and steady state.
The constantness of the engine's hum indicates it's functioning properly.


Steadfastness, as in purpose or affection; faithfulness.


The state or quality of being constant.


The condition or quality of being constant; changelessness.


(uncountable) The quality of being constant; steadiness or faithfulness in action, affections, purpose, etc.


(countable) An unchanging quality or characteristic of a person or thing.


The state or quality of being constant or steadfast; freedom from change; stability; fixedness; immutability; as, the constancy of God in his nature and attributes.


Fixedness or firmness of mind; persevering resolution; especially, firmness of mind under sufferings, steadiness in attachments, or perseverance in enterprise; stability; fidelity.
A fellow of plain uncoined constancy.
Constancy and contempt of danger.


The quality of being free from change or variation


The tendency for perceived objects to give rise to very similar perceptual experiences in spite of wide variations in the conditions of observation


Faithfulness in personal attachment (especially sexual fidelity)


Enduring quality of being unchangeable.
The constancy of her moral values guides her actions.


Is constancy used in personal contexts?

Yes, constancy is commonly used to describe loyalty and reliability in personal relationships.

Is constantness a quantitative measure?

Yes, constantness often implies a quantitative aspect of being the same over time.

Is constantness used in scientific contexts?

Yes, constantness is often used to describe unchanging conditions in scientific contexts.

What is an example of constantness?

An example of constantness is the unchanging temperature in a climate-controlled room.

What does constantness mean?

Constantness refers to the quality of being unchanging or consistent over time.

What does constancy mean?

Constancy refers to steadfastness, faithfulness, or unwavering loyalty.

Can constantness refer to behavior?

Yes, constantness can refer to consistent behavior over time.

Does constancy imply reliability?

Yes, constancy implies reliability and faithfulness.

Can constantness be used to describe technology?

Yes, constantness can describe the consistent performance of technology.

Can constancy be used to describe emotions?

Yes, constancy can describe enduring emotions like love and loyalty.

Can constancy refer to principles?

Yes, constancy often refers to unwavering commitment to principles or values.

What is an example of constancy?

An example of constancy is a friend's unwavering support through difficult times.

Does constantness imply stability?

Yes, constantness implies stability and lack of variation.

Can constancy be observed in relationships?

Yes, constancy is often observed in loyal and steadfast relationships.

Can constantness be observed in nature?

Yes, constantness can be observed in natural phenomena like constant speed or pressure.

How is constancy demonstrated?

Constancy is demonstrated through consistent loyalty and reliability.

How is constantness measured?

Constantness is measured by the lack of variation over time.

Is constancy a qualitative measure?

Yes, constancy conveys a qualitative aspect of steadfastness and loyalty.

Is constantness relevant in engineering?

Yes, constantness is relevant in engineering for maintaining stable conditions.

Is constancy relevant in philosophy?

Yes, constancy is relevant in philosophy for discussing moral and ethical steadfastness.
About Author
Written by
Aimie Carlson
Aimie Carlson, holding a master's degree in English literature, is a fervent English language enthusiast. She lends her writing talents to Difference Wiki, a prominent website that specializes in comparisons, offering readers insightful analyses that both captivate and inform.
Co-written by
Janet White
Janet White has been an esteemed writer and blogger for Difference Wiki. Holding a Master's degree in Science and Medical Journalism from the prestigious Boston University, she has consistently demonstrated her expertise and passion for her field. When she's not immersed in her work, Janet relishes her time exercising, delving into a good book, and cherishing moments with friends and family.

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