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gradient  (gradients plural )A gradient is a slope, or the degree to which the ground slopes. 
 (BRIT)  n-count 
...a gradient of 1 in 3..., The courses are long and punishing, with steep gradients.  
in AM, usually use  grade  

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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"