Connection vs Interaction vs Interface

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

Connection

Top 1,000 (very common)B1noun

Interaction

Top 2,000 (common)B2noun

Interface

Top 1,000 (very common)C1noun
 ConnectionInteractionInterface
Pronunciation🇬🇧 /["/kəˈnekʃn/"]/🇺🇸 /["/kəˈnekʃn/"]/🇬🇧 /["/ˌɪntərˈækʃn/"]/🇺🇸 /["/ˌɪntərˈækʃn/"]/🇬🇧 /["/ˈɪntəfeɪs/"]/🇺🇸 /["/ˈɪntərfeɪs/"]/
MeaningA relationship or link between people or things.The way people talk or work together.The way different things work together or connect.
ExampleThe connection between the two friends grew stronger over time.the interaction between performers and their audiencea user-friendly interface
RegisterNeutralNeutralNeutral
How commonTop 1,000 (very common)Top 2,000 (common)Top 1,000 (very common)
CEFR levelB1B2C1
Part of speechnounnounnoun
Collocationsclear, close, direct, have, discover, establish, in connection with, connection among, connection between, in that/​this connection, loose, electrical, phone, break, charge, fee, connection to, loose, electrical, phone, break, charge, fee, connection to, good, tight, bus, make, miss, connection between, good, tight, bus, make, miss, connection between, good, aristocratic, business, have, use, through connectionsocial interaction, human interaction, customer interaction, face-to-face interaction, interaction designuser interface, interface design, graphical interface
Antonymsdisconnection, separationisolation, separationseparation, isolation, disconnect
Common mistakesConfused with 'correlation' — 'connection' is broader than just a measurable relationship., Using 'connections' as singular — 'connection' is needed for the singular form., Misplacing prepositions — it’s 'connection to' or 'connection with'.Confusing with 'interruption' which is not the same., Using 'interact' incorrectly as a noun instead of verb.Confusing 'interface' with 'interact', Using 'interface' as a verb instead of a noun, Mispronouncing it with incorrect stress on syllables
Usage notesUse 'connection' in both social and technical contexts. Avoid using it in overly casual situations, where simpler terms might be more appropriate.Use 'interaction' when discussing how people or groups engage with each other. It is suitable in both casual and formal situations but may feel less appropriate in very informal contexts like slang or laid-back conversations.Commonly used in tech and design contexts. Avoid in everyday conversation unless talking specifically about technology. Can imply a professional or technical context.

See it in real clips

Connection
Interaction

Frequently asked questions: Connection vs Interaction vs Interface

What's the difference between Connection, Interaction, and Interface?

Connection: A relationship or link between people or things. Interaction: The way people talk or work together. Interface: The way different things work together or connect.

Which is more advanced: Connection, Interaction, and Interface?

Interface is the highest level, at C1, on the CEFR scale.

Are Connection, Interaction, and Interface the same CEFR level?

Connection: B1, Interaction: B2, Interface: C1 on the CEFR scale.

What part of speech are Connection, Interaction, and Interface?

Connection: noun, Interaction: noun, Interface: noun.

Can you show an example of each?

Connection: The connection between the two friends grew stronger over time. Interaction: the interaction between performers and their audience Interface: a user-friendly interface

Can I use Connection, Interaction, and Interface interchangeably?

Not always. Connection, Interaction, and Interface 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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