The best replacement for interaction is communication.

The best alternatives to interaction are rated as following:

★★★★★	communication
★★★★	main effect
★★★★	confounding
★★★★	transaction
★★★★	effect modification
★	interaction
★	technology
★	engagement
★	interdependence
★	online interaction
★	moderation
★	conflict theory
	participation
	interface
	stratification
	interactivity
	facebook
	bodog
	main effects
	user interface
	social networking
	collinearity
	texting
	social structure

Your alternative for interaction is not listed? Suggest!

Speaking about interaction, one probably shouldn't forget about dummy variables.

Other search terms related to interaction and their ratings are:

★★★★★	dummy variables
★★	main effect
★	main effects
★	coumadin
★	warfarin

You have in mind a companion for interaction and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of interaction in all years. Click on graph for more.

interaction

communication

main effect