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Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  officially(adverb) in an official role. officially, he is in charge; officially responsible. 2  formally, officially(adverb) with official authorization. the club will be formally recognized.
unofficial. Unofficial is the phrase commonly used to describe the Friday prior to St. Patrick's day at The University of Illinois. The holiday began when students realized St. Patrick's Day was falling on spring break and they would not be able to celebrate it.