Christina, feed it and let it sit in a warm place to become active and bubbly. By warm, I mean over 65°F; starter is happiest in somewhere in the high 70s, but I realize in cold houses this isn't always possible. It might take a few hours for the starter to bubble, or even up to 8 hours or so, depending on how vigorous it is/how warm the room is. So - to answer your question, "fed" starter means one that's been fed and then sat awhile. Good luck - PJH

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