noun

1. great ability or proficiency; expertness that comes from training, practice, etc.
2. 1. an art, craft, or science, esp. one involving the use of the hands or body
   2. ability in such an art, craft, or science
3. Obsolete knowledge, understanding, or judgment

Etymology: ME, discernment, reason < ON skil, distinction, akin to skilja, to cut apart, separate < IE base *(s)kel-, to cut (> shield, shell): basic sense “ability to separate,” hence “discernment”

intransitive verb