Something that is interactive is something that you can communicate or interact with. The coolest thing about the Internet is how interactive it is. You're constantly putting information and getting other information back.

Think of interactive as the adjectival version of the verb "to interact." The inter- part of the word means "between, together, among," while the act- part means "to do." Put them together, and you get "to do together or among." Turn that verb into an adjective, and you get interactive. Interactive games are the most fun, because the more you and the game interact, the more interesting it is.

Definitions of interactive
  1. adjective
    capable of acting on or influencing each other
    synonyms: interactional
    mutual, reciprocal
    concerning each of two or more persons or things; especially given or done in return
  2. adjective
    (computing) relating to a program or interface that responds to the user's input
  3. adjective
    used especially of drugs or muscles that work together so the total effect is greater than the sum of the two (or more)
    synonyms: synergistic
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    antagonistic, incompatible
    used especially of drugs or muscles that counteract or neutralize each other's effect
    acting to neutralize acid (especially in the stomach)
    counteracting inflammation
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