Look up interaction in Wiktionary, the free dictionary.

Interaction is action that occurs between two or more entities, generally used in philosophy and the sciences. It may refer to:

Science

• Interaction hypothesis, a theory of second language acquisition
• Interaction (statistics), when three or more variables influence each other
• Interactions of actors theory, created by cybernetician Gordon Pask
• Fundamental interaction or fundamental force, the core interactions in physics
• Human–computer interaction, interfaces for people using computers
• Social interaction between people

Biology

• Biological interaction
• Cell–cell interaction
• Drug interaction
• Gene–environment interaction
• Protein–protein interaction

Chemistry

• Aromatic interaction
• Cation-pi interaction
• Metallophilic interaction

Arts and media

• Interaction (album), 1963, by Art Farmer's Quartet
• ACM Interactions, a magazine published by the Association for Computing Machinery
• "Interactions" (The Spectacular Spider-Man), an episode of the animated television series
• 63rd World Science Fiction Convention, titled Interaction