Extension vs Inclusion

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

 ExtensionInclusion
MeaningAn addition to something, like a part that helps it work better.Including everyone; not leaving anyone out.
CEFR levelB2C1
Part of speechnounnoun
Usage notesCommonly used in business and technology contexts. Avoid using it in very casual conversations. It's appropriate when discussing things like phone numbers or deadlines.Use 'inclusion' when discussing social policies or settings where everyone is welcomed. Avoid in very casual conversations.

Frequently asked questions: Extension vs Inclusion

What's the difference between "Extension" and "Inclusion"?

"Extension" means: An addition to something, like a part that helps it work better. "Inclusion" means: Including everyone; not leaving anyone out.

When should I use "Extension" and "Inclusion"?

They can all be used in everyday English.

Are "Extension" and "Inclusion" the same CEFR level?

"Extension" is at B2, "Inclusion" is at C1 on the CEFR scale.

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