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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.
Formal Definition: To express a number in scientific notation (normalized form), we write it in the form a Ã 10 k, where a is a decimal with 1 â¤ a < 10 and k is an integer. Example: In scientific notation, Avogadro's number is approximately 6.022141793 Ã 10 23. Matching this with the formal definition, a is the decimal 6.022141793 and k is the exponent 23. If we multiply this out, the positive twenty-third power moves the decimal point 23 place values right, making the decimal part of the number larger by that many place values.