inceptisolPronunciation: /ɪnˈsɛptɪsɒl/Definition of inceptisol noun Soil Science a soil of an order comprising freely draining soils in which the formation of distinct horizons is not far advanced, such as brown earth. Origin: 1960s: from Latin inceptum 'beginning' (from the verb incipere) + -solinceptisol in other Oxford dictionaries Definition of inceptisol in the US English dictionary