Simple past tense and past participle of minify.(verb)
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Use "minified" in a sentence
"Enough of the main site's functionality is available in the "minified" version for it to be attractive to people with less frequent Internet access."
"Microsoft Ajax Minifier - One thing that jQuery has bested Microsoft on for quite some time is library size. jQuery is about 50 KB in its commonly distributed "minified" format, Microsoft Ajax is about 100 KB."