noun

• (obsolete) Discrimination; judgment; propriety; reason; cause.
  "Him so I sought, and so at last I fownd Where him that witch had thralled to her will, In chaines of lust and lewde desyres ybownd And so transformed from his former skill, That me he knew not, nether his owne ill;"
• (obsolete) Knowledge; understanding.
  "And Howell Dha shall goodly well indew The salvage minds with skill of just and trew;"
• (obsolete) Display of art; exercise of ability; contrivance; address.
  "Richard was well ſtored with men, the bones; and quickly got money, the ſinews of warre; by a thousand Princely ſkills gathering ſo much coin as if he meant not to return, becauſe looking back would unbowe his reſolution."

adj

• (UK, slang) Great, excellent.
  "Well, unfortunately for you, my dearest Waggipoos, I'm much more skill than you!"

verb

• (transitive) To set apart; separate.
• (transitive, chiefly dialectal) To discern; have knowledge or understanding; to know how (to).
  "I cannot skill of these Thy ways […]"
• (transitive, dialectal, Scotland, Northern England, rare) To know; to understand.
  "As for the virginals I have none here that skill of them, except the young lord."
• (intransitive) To have knowledge or comprehension; discern.