The meaning of INTERACTION is mutual or reciprocal action or influence. How to use interaction in a sentence. 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. Founded in 1984, InterAction is the largest alliance of international NGOs and partners in the United States. 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. INTERACTION meaning: 1. an occasion when two or more people or things communicate with or react to each other: 2. an…. Learn more. 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. Use WebMD’s Drug Interaction Checker to identify potential interactions between medications, supplements, and foods. Reduce side effects and support safer treatment decisions. 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.