Available Definitions:
1) n. - A partition, covering, or frame of parallel or cross bars; a latticework resembling a window grate; as, the grating of a prison or convent.
2) n. - A system of close equidistant and parallel lines lines or bars, especially lines ruled on a polished surface, used for producing spectra by diffraction; -- called also diffraction grating.
3) n. - The strong wooden lattice used to cover a hatch, admitting light and air; also, a movable Lattice used for the flooring of boats.
4) a. - That grates; making a harsh sound; harsh.
5) n. - A harsh sound caused by attrition.
6) v. t. - To reduce to small particles by rubbing with anything rough or indented; as, to grate a nutmeg.
7) v. t. - To fret; to irritate; to offend.
8) v. i. - To make a harsh sound by friction.
9) v. i. - To produce the effect of rubbing with a hard rough material; to cause wearing, tearing, or bruising. Hence; To produce exasperation, soreness, or grief; to offend by oppression or importunity.