if u knwo that cliff is A steep high face of rock, then its easy to remember
ac+cliv+ity....cliv is similar to CLIMB..can relate to the meaning...climbing the steep upslope of a hill
try to look for 'cliff' in this word and cliff means a high, steep face of rock. Also, try to look for elevate (elivity) in this word which also means upslope.
ac+CLIV+ity..cliv= means SLOPE or tendency so an UPWARD SLOPE.
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