Simple past tense and past participle of tune.(verb)
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Use "tuned" in a sentence
"Most of her supporters, will realize who is more in tuned with thier ideas and vote Obama, anyway."
"This is the most I have ever watched CNN or so in tuned with politics."
"In all seriousness, this Monday I once again tuned into an entire episode of 2.5 MEN just to make sure the show continued to deserve my incessant criticism."