Definitions
1.verbTo make cold, to sharpen.
2.verbTo utter a keen.
3.verbTo utter with a loud wailing voice or wordless cry.
4.verbTo mourn.
5.nounIntense mournful wailing after a death, often at a funeral or wake
6.noun(by extension) An unpleasant wailing sound.
7.adjectiveSharp, shrill, especially of a sound."The keening sound of a dentist's drill sets my teeth on edge."