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Explanation: Maybe I missed something here, but isn't this just a basic dictionary translation??
1 (edil.) centring, centering
2 (aer.) ribbing
3 (mecc.) camber.
Found lots of Google hits on centering of metal pieces:
The demands of the finished machined workpiece and the geometric design require one centering process—which positions the workpiece with reference to X- and Y-axes—and a second centering process, which determines the rotary position of the workpiece around the Z-axis. Positioning in Z direction is made by placing the workpiece onto three fixed rests.
Hydraulic clamping fixtures were chosen due to the high quality demands of the workpiece, the required clearance of operators and the fact that the machine tool would run in three-shift operation. The hydraulic positioning, clamping and support elements are arranged on an aluminum base plate. Oil supply is made through drilled channels in the base and tubing.
Centering is accomplished with two different clamping and centering elements. X- and Y-axes are determined by a three-point concentric positioning and clamping element in the cast bearing hole of the workpiece. Rotation around the Z-axis is determined by linear centering elements at one of the four brackets.