To a detectable degree, sufficient to be noticed.(adverb)
In truth and observably.(adverb)
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Use "noticeably" in a sentence
"McCain noticeably began to falter on his stance on "Don't Ask, Don't Tell" after former congressman J.D. Hayworth announced the launch of his primary campaign to unseat the Republican lawmaker."
"I'd work hard enough to get the health and weight-loss benefits of (A) and (B), and also to begin noticeably improving my aerobic fitness and strength."
"People notice different details and usually speak in noticeably different ways."