DECLIVITY Meaning of DECLIVITY in English [de.cliv.i.ty] n, pl -ties [L declivitat-, declivitas, fr. declivis sloping down, fr. de- + clivus slope, hill; akin to L clinare] (1612) 1: downward inclination 2: a descending slope Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012