This is my new word. I have now seen it several times in various contexts and have looked in a dictionary for its meaning twice. It means interchangeable, exchangeable, or substitutable. Yes, those are the exact words. . .although I wouldn't have guessed the last one WAS a word. Research says it takes 7-9 exposures to a word before it sticks in the memory. I'm guessing I'm at 5 or 6. . .maybe I can beat the odds.