Constitutional vs Legal vs Legislative

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

Constitutional

FormalTop 3,000 (common)C1adjective

Legal

FormalTop 1,000 (very common)B1adjective

Legislative

FormalTop 5,000 (fairly common)C1adjective
Most common: Legal
 ConstitutionalLegalLegislative
Pronunciation🇬🇧 /["/ˌkɒnstɪˈtjuːʃənl/"]/🇺🇸 /["/ˌkɑːnstɪˈtuːʃənl/"]/🇬🇧 /["/ˈliːɡl/"]/🇺🇸 /["/ˈliːɡl/"]/🇬🇧 /["/ˈledʒɪslətɪv/"]/🇺🇸 /["/ˈledʒɪsleɪtɪv/"]/
MeaningRelated to the constitution or laws of a country.Related to the law or rules.Related to laws or making laws.
Example**constitutional government/reform**It is important to understand your legal rights before signing any contract.a **legislative assembly/body/council**
RegisterFormalFormalFormal
How commonTop 3,000 (common)Top 1,000 (very common)Top 5,000 (fairly common)
CEFR levelC1B1C1
Part of speechadjectiveadjectiveadjective
Collocationsconstitutional rights, constitutional amendment, constitutional lawbe, become, make something, completely, perfectlylegislative process, legislative branch, legislative proposal, legislative authority, legislative session
Antonymsunconstitutional, illegalillegal, unlawful, illicitunlawful, illegal
Common mistakesConfused with 'constitutionality' which is a different noun., Using it in casual conversations where simpler words are better., Mixing up the adjective form with the noun form.Confused with 'legitimate' when discussing valid standards., Used in non-legal contexts, such as casual conversations.Confused with 'legislation' which refers to the laws themselves., Using in informal contexts where simpler terms like 'law' would suffice.
Usage notesUsed primarily in legal and formal contexts. It may not be suitable for everyday conversation. Often used when discussing legal rights, government structures, or political debates.Use 'legal' when discussing laws, rights, or anything connected to the law. Avoid using it in informal contexts where everyday topics are discussed.Used in contexts involving government, law-making bodies, or political discussions. Not suitable for informal conversations.

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Legal
Legislative

Frequently asked questions: Constitutional vs Legal vs Legislative

What's the difference between Constitutional, Legal, and Legislative?

Constitutional: Related to the constitution or laws of a country. Legal: Related to the law or rules. Legislative: Related to laws or making laws.

Which is more common: Constitutional, Legal, and Legislative?

Legal is the most common in everyday English.

Are Constitutional, Legal, and Legislative the same CEFR level?

Constitutional: C1, Legal: B1, Legislative: C1 on the CEFR scale.

What part of speech are Constitutional, Legal, and Legislative?

Constitutional: adjective, Legal: adjective, Legislative: adjective.

Can you show an example of each?

Constitutional: **constitutional government/reform** Legal: It is important to understand your legal rights before signing any contract. Legislative: a **legislative assembly/body/council**

Can I use Constitutional, Legal, and Legislative interchangeably?

Not always. Constitutional, Legal, and Legislative 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.