When a geometry is described by a set of axioms, the notion of a line is usually left undefined (a so-called primitive object). The properties of lines are then determined by the axioms which refer to them.
Definition of mull 1: friable forest humus that forms a layer of mixed organic matter and mineral soil and merges gradually into the mineral soil beneath 2: a finely powdered solid especially in a suspension
English Collins Dictionary-English Definition & Thesaurus &nbsp. settle [2] n a seat, for two or more people, usually made of wood with a high back and arms, and sometimes having a storage space in the boxlike seat (Old English setl; related to Old Saxon, Old High German sezzal).settle [2]. a seat, for two or more people, usually made of wood with a high back and arms, and sometimes having a storage space in the boxlike seat. (Old English setl; related to Old Saxon, Old High German sezzal). English Collins Dictionary-English Definition & Thesaurus.