LEVELLING
\lˈɛvəlɪŋ], \lˈɛvəlɪŋ], \l_ˈɛ_v_ə_l_ɪ_ŋ]\
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The reduction of uneven surfaces to a level; the art or process of ascertaining the different elevations of objects on the surface of the earth.
By Nuttall, P.Austin.