tilth Syllabification: (tilth)Pronunciation: /tilTH/Definition of tilth noun cultivation of land; tillage. [in singular] the condition of tilled soil, especially in respect to suitability for sowing seeds:he could determine whether the soil was of the right tilth prepared surface soil. Origin: Old English tilth, tilthe, from tilian (see till3)tilth in other Oxford dictionaries Definition of tilth in the British & World English dictionary