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From Longman Dictionary of Contemporary English
Related topics: Maths
fractionalfrac‧tion‧al /ˈfrækʃənəl/ adjective  1 SMALLvery small in amount syn tiny a fractional increase a fractional hesitation before he said yes2 technical happening or done in a series of steps3 technicalHM relating to fractions, in mathematicsfractionally adverb
Examples from the Corpus
fractionalAs fractional contracts can not be written it is almost inevitable that the hedge will not be perfect.fractional distillationThe fractional excretion of magnesium rises as glomerular filtration rate falls.Their rating has fallen since last July on 15 out of 16 issues, with only a fractional improvement on unemployment.At every step of the way, some fractional increase in lung area will be an advantage.The report shows a fractional sales increase for the month of December.The Prince and his wife must have died at the very same moment, to within a fractional thousandth of a second.fractional increaseAt every step of the way, some fractional increase in lung area will be an advantage.
From Longman Business Dictionaryfractionalfrac‧tion‧al /ˈfrækʃənəl/ adjective1a fractional amount, change, gain etc is very smallJuly’s Consumer Price Index was 231.2, a fractional change from the 231 index reported in June.While blue-chip stocks ended lower, the broader market held onto fractional gains.fractionally adverbRevenue for the period fell fractionally to $22,056,000 from $22,722,000.2related to part of a larger wholeHarvesting crops is only a fractional part of the whole farming process.
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