an instrumentality needed for an undertaking or to perform a service
a formation of people or things one beside another
a mark that is long relative to its width
a formation of people or things one behind another
a length (straight or curved) without breadth or thickness; the trace of a moving point
a single frequency (or very narrow band) of radiation in a spectrum
a course of reasoning aimed at demonstrating a truth or falsehood; the methodical process of logical reasoning
a fortified position (especially one marking the most forward position of troops)
