This tool explains what the interaction is and how it occurs, the level of importance and how to handle the drug interaction. It will also display any interactions between your chosen medicines, alcohol, food, beverages, or medical conditions. INTERACTION definition: 1. an occasion when two or more people or things communicate with or react to each other: 2. an…. Learn more. If you interact with someone — by talking, looking, sharing, or engaging in any kind of action that involves the two of you — you can be said to have had an interaction with that person. (General Physics) physics the transfer of energy between elementary particles, between a particle and a field, or between fields. See strong interaction, electromagnetic interaction, fundamental interaction, gravitational interaction, weak interaction, electroweak interaction. This disambiguation page lists articles associated with the title Interaction. If an internal link incorrectly led you here, you may wish to change the link to point directly to the intended article. The meaning of INTERACTION is mutual or reciprocal action or influence. How to use interaction in a sentence. interaction (countable and uncountable, plural interactions) The situation or occurrence in which two or more things act upon one another to produce an effect; the effect resulting from such a situation or occurrence. INTERACTION meaning: 1. an occasion when two or more people or things communicate with or react to each other: 2. an…. Learn more. InterAction is a platform for managing and organizing business relationships effectively. InterAction brings together U.S.-based global NGOs to navigate change, coordinate action, and strengthen collective impact in a rapidly evolving humanitarian and development landscape.