Constant vs Permanent

When to use each in English, with meaning, register, and examples.

Constant

Top 2,000 (common)B2adjective

Permanent

Top 2,000 (common)B2adjective
 ConstantPermanent
Pronunciation🇬🇧 /["/ˈkɒnstənt/"]/🇺🇸 /["/ˈkɑːnstənt/"]/🇬🇧 /["/ˈpɜːmənənt/"]/🇺🇸 /["/ˈpɜːrmənənt/"]/
MeaningSomething that stays the same and doesn't change.Lasting forever or a long time without changing.
ExampleShe is a constant source of inspiration for her team.The tattoo on her arm is a permanent reminder of her travels.
RegisterNeutralNeutral
How commonTop 2,000 (common)Top 2,000 (common)
CEFR levelB2B2
Part of speechadjectiveadjective
Collocationsbe, remain, stay, fairly, reasonably, relatively, across, over, be, remain, stay, fairly, reasonably, relatively, across, overbe, prove, seem, almost, relatively, seemingly
Antonymsvariable, changing, inconstanttemporary, transient, fleeting
Common mistakes'Constant' confused with 'constant' meaning an unchanged quantity in mathematics., 'Constantly' used incorrectly as an adjective instead of adverb., 'Constants' misused in plural form when referring to singular concepts.Confused with 'temporary' which means the opposite., Using it to describe things that are not fixed like temporary jobs., Spelling errors or misuse of similar-sounding words.
Usage notesUse 'constant' when discussing something that remains unchanged over time. It can be used in both formal and informal contexts, but is often used in academic or scientific discussions.Use 'permanent' when something is fixed or unchangeable. It's suitable for both formal and everyday contexts, but avoid using it when speaking about temporary situations.

Frequently asked questions: Constant vs Permanent

What's the difference between Constant and Permanent?

Constant: Something that stays the same and doesn't change. Permanent: Lasting forever or a long time without changing.

Are Constant and Permanent the same CEFR level?

Constant: B2, Permanent: B2 on the CEFR scale.

What part of speech are Constant and Permanent?

Constant: adjective, Permanent: adjective.

Can you show an example of each?

Constant: She is a constant source of inspiration for her team. Permanent: The tattoo on her arm is a permanent reminder of her travels.

Can I use Constant and Permanent interchangeably?

Not always. Constant and Permanent are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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