interact

interact — verb

1. to talk, play, or work together with someone, sharing words, actions, or feeling

1.verbintransitiveB1
Definition

to talk, play, or work together with someone, sharing words, actions, or feelings so that both sides are involved and affected.

Example

Ziad finds it hard to interact with new classmates because he is very shy.

interact + with + person (intransitive)

The children at the summer camp interacted through games and songs all afternoon.

interact through + activity (manner)

Common collocations
  • interact with people
  • interact socially
  • interact directly
  • find it hard to interact
Synonyms
  • communicate

    broader; can be one-way (a speech) or two-way; 'interact' always implies back-and-forth

  • engage

    more formal, often used in professional or academic contexts

  • socialize

    limited to informal, fun contexts like parties or gatherings

Antonyms
  • ignore

    to deliberately pay no attention to someone

  • avoid

    to stay away from someone on purpose

Grammar Patterns

interact + with + noun phrase (person or group)

Usage Note

Interact always needs the preposition 'with' when the other person or group is mentioned. It never takes a direct object. Distinguish from sense 2, where the interaction is with digital content rather than with people face to face.

Common Mistakes

I interacted him at the party.
I interacted with him at the party.
'interact' requires 'with' before mentioning the other person; it cannot take a direct object.

2. when you react to digital content on a website or app — for example, by writing

2.verbintransitiveB1
Definition

when you react to digital content on a website or app — for example, by writing a comment, tapping a 'like' button, or sharing a post with your friends.

Example

Quan likes to interact with his favourite musicians by leaving comments on their videos.

interact with + person + by + gerund (manner)

The more viewers interact with a post on social media, the more people see it.

correlative structure: the more… the more…

Common collocations
  • interact with a post
  • interact with content
  • interact online
  • interact via comments
Synonyms
  • engage with

    slightly more formal; common in social-media marketing

  • respond to

    more specific — implies a direct reply rather than just viewing

Antonyms
  • ignore

    to see content but not click, like, or comment

  • scroll past

    colloquial; to keep moving without stopping to engage

Grammar Patterns

interact + with + noun phrase (digital content or platform)

Usage Note

The thing being interacted with is always digital content (a post, video, comment) or a platform (website, app). Unlike sense 1, this sense does not imply a personal relationship — just an action on a screen.

Common Mistakes

I interacted the comment.
I interacted with the comment.
'interact' is always intransitive and requires 'with'.

3. when two or more things such as chemicals, machines, or natural systems influenc

3.verbintransitiveB2
Definition

when two or more things such as chemicals, machines, or natural systems influence one another's behaviour or state.

Example

When you mix baking soda and vinegar, the two substances interact and create bubbles.

interact + and + result (cause-and-effect)

The doctor explained how certain medicines interact with each other inside the body.

interact with each other (reciprocal structure)

Common collocations
  • interact with each other
  • chemically interact
  • substances interact
  • interact closely
Synonyms
  • combine

    implies the things mix or join, not just affect each other

  • react

    stronger and more specific — common in chemistry (chemical reaction)

  • work together

    informal; suggests cooperation rather than neutral mutual effect

Antonyms
  • cancel out

    when two forces or effects stop each other

Grammar Patterns

interact + with + noun phrase (substance, system, or force)

Usage Note

This sense is most common in science, technology, and medicine. The subjects are not people but substances, forces, or systems. Unlike sense 1 and 2, the interaction can be invisible and automatic — it does not require intention or awareness.

Common Mistakes

The chemicals interact each other.
The chemicals interact with each other.
'interact' never takes a direct object; always use 'with'.

Word family

Synonym discussion

Sense: verb/1

All four words describe some form of human connection, but they differ in scope and formality. 'Communicate' is the broadest: you can communicate by writing a letter, giving a speech, or even sending a one-way signal — no back-and-forth is required. 'Interact' always implies two-way exchange: each person affects the other. 'Engage' is more formal and often used in professional or academic settings ('the lecturer engaged the students in a debate'), and it also carries a sense of active effort. 'Socialize' is limited to informal, leisure contexts such as parties, dinners, or casual get-togethers. 'Converse' is the most formal of the four and specifically refers to spoken dialogue. For everyday two-way communication, especially face to face, 'interact' is the most natural choice: 'The shy girl found it hard to interact with her teammates at first.'

communicate ↗engage ↗socialize ↗converse ↗

Common collocations

Nouns

Adverbs

Phrases

  • way people interact
  • opportunity to interact

Prepositions

Etymology

LatinEnglish

'Interact' was formed in English around the 1830s by combining the Latin prefix 'inter-' (meaning 'between' or 'among') with the verb 'act' (from Latin 'agere', meaning 'to do' or 'to drive'). It was first used in scientific writing to describe how forces or chemical substances act upon one another. The meaning later expanded to include human communication and, most recently, engagement with online content.