To act on each other: "More than a dozen variable factors could interact, with their permutations running into the thousands” ( Tom Clancy). (verb-intransitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "interact" in a sentence
"But if I had to choose it would be the Montgommerys and the Taggarts from Jude Deveraux I think, the way those families interact is fantastic reading and I wouldn't mind seeing that in reality."
"As with trial testimony, job interviews, and blind dates, seeing people interact is the only way to understand what is going on."
"How he and Tavi interact is integral to the story, and needs to be developed even further."