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
Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  mull(noun) a term used in Scottish names of promontories. 2  Mull(verb) an island in western Scotland in the Inner Hebrides. 3  chew over, think over, meditate, ponder, excogitate, contemplate, muse, reflect, mull, mull over, ruminate, speculate(verb) reflect deeply on a subject.