A line dividing any symmetrical jet figure or area of revolution into two symmetrical halves.
The line around which any figure can be revolved to create a volume of transformation.
The range in a drawing for each side of which points when you look at the drawing or figure lie at equal distances. In all designing of symmetrical constructions the center-lines are drawn first, and because of these all proportions are let go.
plural The lines through center of mass or center of gravity of a body parallel into three coördinate axes found in analytical geometry.
The range joining the centers of two synchronous shafts in the same plane, or perpendicular to both axes if they're not in identical plane, into the design of toothed gearing. See in addition distinct center, under line.