Windows 7 is still the most widely used OS by a significant margin and Microsoft does fear that it will have a tough time trying to move these users to the new OS despite the free upgrade offer. - the amount by which one thing is more or less than another, In our office the women outnumber the men three to one. - to be greater in number than someone or something, There has been some unusual variance in temperature this month. - the fact that two or more things are different, or the amount or number by which they are different, Remember, with regard to free online dating, be honest up to a certain degree but don't be brutally honest. - in connection with someone or something, Sales have gradually tapered off. - to become gradually smaller or weaker, or happen less often, Her wages fluctuate between £150 and £200 a week. - to change, especially continuously and between one level or thing and another, The results are well above/below what we expected. - used to emphasize some prepositions,

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